diff --git a/packages/devextreme-angular/src/ui/tree-view/index.ts b/packages/devextreme-angular/src/ui/tree-view/index.ts
index 1531af369808..21dc9c2e8313 100644
--- a/packages/devextreme-angular/src/ui/tree-view/index.ts
+++ b/packages/devextreme-angular/src/ui/tree-view/index.ts
@@ -75,8 +75,8 @@ import { DxiTreeViewItemComponent } from 'devextreme-angular/ui/tree-view/nested
         IterableDifferHelper
     ]
 })
-export class DxTreeViewComponent<TKey = any> extends DxComponent implements OnDestroy, OnChanges, DoCheck {
-    instance: DxTreeView<TKey> = null;
+export class DxTreeViewComponent<TItem = any, TKey = any> extends DxComponent implements OnDestroy, OnChanges, DoCheck {
+    instance: DxTreeView<TItem, TKey> = null;
 
     /**
      * [descr:WidgetOptions.accessKey]
diff --git a/packages/devextreme-react/src/tree-view.ts b/packages/devextreme-react/src/tree-view.ts
index dc532165d7f7..d054114c652c 100644
--- a/packages/devextreme-react/src/tree-view.ts
+++ b/packages/devextreme-react/src/tree-view.ts
@@ -19,34 +19,34 @@ type ReplaceFieldTypes<TSource, TReplacement> = {
   [P in keyof TSource]: P extends keyof TReplacement ? TReplacement[P] : TSource[P];
 }
 
-type ITreeViewOptionsNarrowedEvents<TKey = any> = {
-  onContentReady?: ((e: ContentReadyEvent<TKey>) => void);
-  onDisposing?: ((e: DisposingEvent<TKey>) => void);
-  onInitialized?: ((e: InitializedEvent<TKey>) => void);
-  onItemClick?: ((e: ItemClickEvent<TKey>) => void);
-  onItemCollapsed?: ((e: ItemCollapsedEvent<TKey>) => void);
-  onItemContextMenu?: ((e: ItemContextMenuEvent<TKey>) => void);
-  onItemExpanded?: ((e: ItemExpandedEvent<TKey>) => void);
-  onItemHold?: ((e: ItemHoldEvent<TKey>) => void);
-  onItemRendered?: ((e: ItemRenderedEvent<TKey>) => void);
-  onSelectAllValueChanged?: ((e: SelectAllValueChangedEvent<TKey>) => void);
+type ITreeViewOptionsNarrowedEvents<TItem = any, TKey = any> = {
+  onContentReady?: ((e: ContentReadyEvent<TItem, TKey>) => void);
+  onDisposing?: ((e: DisposingEvent<TItem, TKey>) => void);
+  onInitialized?: ((e: InitializedEvent<TItem, TKey>) => void);
+  onItemClick?: ((e: ItemClickEvent<TItem, TKey>) => void);
+  onItemCollapsed?: ((e: ItemCollapsedEvent<TItem, TKey>) => void);
+  onItemContextMenu?: ((e: ItemContextMenuEvent<TItem, TKey>) => void);
+  onItemExpanded?: ((e: ItemExpandedEvent<TItem, TKey>) => void);
+  onItemHold?: ((e: ItemHoldEvent<TItem, TKey>) => void);
+  onItemRendered?: ((e: ItemRenderedEvent<TItem, TKey>) => void);
+  onSelectAllValueChanged?: ((e: SelectAllValueChangedEvent<TItem, TKey>) => void);
 }
 
-type ITreeViewOptions<TKey = any> = React.PropsWithChildren<ReplaceFieldTypes<Properties<TKey>, ITreeViewOptionsNarrowedEvents<TKey>> & IHtmlOptions & {
-  dataSource?: Properties<TKey>["dataSource"];
+type ITreeViewOptions<TItem = any, TKey = any> = React.PropsWithChildren<ReplaceFieldTypes<Properties<TItem, TKey>, ITreeViewOptionsNarrowedEvents<TItem, TKey>> & IHtmlOptions & {
+  dataSource?: Properties<TItem, TKey>["dataSource"];
   itemRender?: (...params: any) => React.ReactNode;
   itemComponent?: React.ComponentType<any>;
   defaultItems?: Array<dxTreeViewItem>;
   onItemsChange?: (value: Array<dxTreeViewItem>) => void;
 }>
 
-interface TreeViewRef<TKey = any> {
-  instance: () => dxTreeView<TKey>;
+interface TreeViewRef<TItem = any, TKey = any> {
+  instance: () => dxTreeView<TItem, TKey>;
 }
 
 const TreeView = memo(
   forwardRef(
-    <TKey = any>(props: React.PropsWithChildren<ITreeViewOptions<TKey>>, ref: ForwardedRef<TreeViewRef<TKey>>) => {
+    <TItem = any, TKey = any>(props: React.PropsWithChildren<ITreeViewOptions<TItem, TKey>>, ref: ForwardedRef<TreeViewRef<TItem, TKey>>) => {
       const baseRef = useRef<ComponentRef>(null);
 
       useImperativeHandle(ref, () => (
@@ -78,7 +78,7 @@ const TreeView = memo(
       ]), []);
 
       return (
-        React.createElement(BaseComponent<React.PropsWithChildren<ITreeViewOptions<TKey>>>, {
+        React.createElement(BaseComponent<React.PropsWithChildren<ITreeViewOptions<TItem, TKey>>>, {
           WidgetClass: dxTreeView,
           ref: baseRef,
           subscribableOptions,
@@ -91,7 +91,7 @@ const TreeView = memo(
       );
     },
   ),
-) as <TKey = any>(props: React.PropsWithChildren<ITreeViewOptions<TKey>> & { ref?: Ref<TreeViewRef<TKey>> }) => ReactElement | null;
+) as <TItem = any, TKey = any>(props: React.PropsWithChildren<ITreeViewOptions<TItem, TKey>> & { ref?: Ref<TreeViewRef<TItem, TKey>> }) => ReactElement | null;
 
 
 // owners:
diff --git a/packages/devextreme/js/__internal/grids/new/grid_core/inferno_wrappers/tree_view.ts b/packages/devextreme/js/__internal/grids/new/grid_core/inferno_wrappers/tree_view.ts
index 508677403c4c..180abc9bb0f9 100644
--- a/packages/devextreme/js/__internal/grids/new/grid_core/inferno_wrappers/tree_view.ts
+++ b/packages/devextreme/js/__internal/grids/new/grid_core/inferno_wrappers/tree_view.ts
@@ -4,7 +4,12 @@ import dxTreeView from '@js/ui/tree_view';
 
 import { InfernoWrapper } from './widget_wrapper';
 
-export class TreeView extends InfernoWrapper<TreeViewProperties, dxTreeView> {
+export class TreeView<
+  TItem extends TreeViewItemProperties = TreeViewItemProperties,
+> extends InfernoWrapper<
+  TreeViewProperties,
+  dxTreeView<TItem>
+> {
   protected getComponentFabric(): typeof dxTreeView {
     return dxTreeView;
   }
@@ -29,15 +34,15 @@ export class TreeView extends InfernoWrapper<TreeViewProperties, dxTreeView> {
     prevProps: TreeViewProperties,
     props: TreeViewProperties,
   ): boolean {
-    const oldItems = (prevProps.items ?? []).map(({ selected, ...restProps }) => restProps);
-    const newItems = (props.items ?? []).map(({ selected, ...restProps }) => restProps);
+    const oldItems = (prevProps.items ?? []).map(({ selected, ...restProps }: TItem) => restProps);
+    const newItems = (props.items ?? []).map(({ selected, ...restProps }: TItem) => restProps);
 
     const onlySelectionChanged = equalByValue(oldItems, newItems);
 
     return onlySelectionChanged;
   }
 
-  private updateSelection(items: TreeViewItemProperties[]): void {
+  private updateSelection(items: TItem[]): void {
     const treeView = this.component;
 
     if (!treeView) {
diff --git a/packages/devextreme/js/ui/tree_view.d.ts b/packages/devextreme/js/ui/tree_view.d.ts
index 42b837686222..9d5f26b45d9c 100644
--- a/packages/devextreme/js/ui/tree_view.d.ts
+++ b/packages/devextreme/js/ui/tree_view.d.ts
@@ -34,16 +34,18 @@ import {
 
 import dxScrollable from './scroll_view/ui.scrollable';
 
+type ItemLike = string | Item | any;
+
 /**
  * @docid _ui_tree_view_ItemInfo
  * @hidden
  */
-export interface ItemInfo<TKey = any> {
+export interface ItemInfo<TItem extends ItemLike = any, TKey= any> {
     /**
      * @docid _ui_tree_view_ItemInfo.itemData
      * @type object
      */
-    readonly itemData?: Item;
+    readonly itemData?: TItem;
     /** @docid _ui_tree_view_ItemInfo.itemElement */
     readonly itemElement?: DxElement;
     /** @docid _ui_tree_view_ItemInfo.itemIndex */
@@ -52,7 +54,7 @@ export interface ItemInfo<TKey = any> {
      * @docid _ui_tree_view_ItemInfo.node
      * @type dxTreeViewNode
      */
-    readonly node?: Node<TKey>;
+    readonly node?: Node<TItem, TKey>;
 }
 
 export {
@@ -72,7 +74,7 @@ export type TreeViewExpandEvent = 'dblclick' | 'click';
  * @type object
  * @inherits EventInfo
  */
-export type ContentReadyEvent<TKey = any> = EventInfo<dxTreeView<TKey>>;
+export type ContentReadyEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>>;
 
 /**
  * @docid _ui_tree_view_DisposingEvent
@@ -80,7 +82,7 @@ export type ContentReadyEvent<TKey = any> = EventInfo<dxTreeView<TKey>>;
  * @type object
  * @inherits EventInfo
  */
-export type DisposingEvent<TKey = any> = EventInfo<dxTreeView<TKey>>;
+export type DisposingEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>>;
 
 /**
  * @docid _ui_tree_view_InitializedEvent
@@ -88,7 +90,7 @@ export type DisposingEvent<TKey = any> = EventInfo<dxTreeView<TKey>>;
  * @type object
  * @inherits InitializedEventInfo
  */
-export type InitializedEvent<TKey = any> = InitializedEventInfo<dxTreeView<TKey>>;
+export type InitializedEvent<TItem extends ItemLike = any, TKey = any> = InitializedEventInfo<dxTreeView<TItem, TKey>>;
 
 /**
  * @docid _ui_tree_view_ItemClickEvent
@@ -96,7 +98,7 @@ export type InitializedEvent<TKey = any> = InitializedEventInfo<dxTreeView<TKey>
  * @type object
  * @inherits NativeEventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemClickEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, KeyboardEvent | MouseEvent | PointerEvent> & ItemInfo<TKey>;
+export type ItemClickEvent<TItem extends ItemLike = any, TKey = any> = NativeEventInfo<dxTreeView<TItem, TKey>, KeyboardEvent | MouseEvent | PointerEvent> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_ItemCollapsedEvent
@@ -104,7 +106,7 @@ export type ItemClickEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, Keybo
  * @type object
  * @inherits NativeEventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemCollapsedEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, MouseEvent | PointerEvent> & ItemInfo<TKey>;
+export type ItemCollapsedEvent<TItem extends ItemLike = any, TKey = any> = NativeEventInfo<dxTreeView<TItem, TKey>, MouseEvent | PointerEvent> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_ItemContextMenuEvent
@@ -112,7 +114,7 @@ export type ItemCollapsedEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, M
  * @type object
  * @inherits NativeEventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemContextMenuEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, MouseEvent | PointerEvent | TouchEvent> & ItemInfo<TKey>;
+export type ItemContextMenuEvent<TItem extends ItemLike = any, TKey = any> = NativeEventInfo<dxTreeView<TItem, TKey>, MouseEvent | PointerEvent | TouchEvent> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_ItemExpandedEvent
@@ -120,7 +122,7 @@ export type ItemContextMenuEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>,
  * @type object
  * @inherits NativeEventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemExpandedEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, MouseEvent | PointerEvent> & ItemInfo<TKey>;
+export type ItemExpandedEvent<TItem extends ItemLike = any, TKey = any> = NativeEventInfo<dxTreeView<TItem, TKey>, MouseEvent | PointerEvent> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_ItemHoldEvent
@@ -128,7 +130,7 @@ export type ItemExpandedEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, Mo
  * @type object
  * @inherits NativeEventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemHoldEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, MouseEvent | PointerEvent | TouchEvent> & ItemInfo<TKey>;
+export type ItemHoldEvent<TItem extends ItemLike = any, TKey = any> = NativeEventInfo<dxTreeView<TItem, TKey>, MouseEvent | PointerEvent | TouchEvent> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_ItemRenderedEvent
@@ -136,7 +138,7 @@ export type ItemHoldEvent<TKey = any> = NativeEventInfo<dxTreeView<TKey>, MouseE
  * @type object
  * @inherits EventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemRenderedEvent<TKey = any> = EventInfo<dxTreeView<TKey>> & ItemInfo<TKey>;
+export type ItemRenderedEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_ItemSelectionChangedEvent
@@ -144,7 +146,7 @@ export type ItemRenderedEvent<TKey = any> = EventInfo<dxTreeView<TKey>> & ItemIn
  * @type object
  * @inherits EventInfo,_ui_tree_view_ItemInfo
  */
-export type ItemSelectionChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>> & ItemInfo<TKey>;
+export type ItemSelectionChangedEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>> & ItemInfo<TItem, TKey>;
 
 /**
  * @docid _ui_tree_view_OptionChangedEvent
@@ -152,7 +154,7 @@ export type ItemSelectionChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>>
  * @type object
  * @inherits EventInfo,ChangedOptionInfo
  */
-export type OptionChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>> & ChangedOptionInfo;
+export type OptionChangedEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>> & ChangedOptionInfo;
 
 /**
  * @docid _ui_tree_view_SelectAllValueChangedEvent
@@ -160,7 +162,7 @@ export type OptionChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>> & Chang
  * @type object
  * @inherits EventInfo
  */
-export type SelectAllValueChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>> & {
+export type SelectAllValueChangedEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>> & {
     /** @docid _ui_tree_view_SelectAllValueChangedEvent.value */
     readonly value?: boolean | undefined;
 };
@@ -171,7 +173,7 @@ export type SelectAllValueChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>>
  * @type object
  * @inherits EventInfo
  */
-export type SelectionChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>>;
+export type SelectionChangedEvent<TItem extends ItemLike = any, TKey = any> = EventInfo<dxTreeView<TItem, TKey>>;
 
 /**
  * @deprecated use Properties instead
@@ -179,8 +181,8 @@ export type SelectionChangedEvent<TKey = any> = EventInfo<dxTreeView<TKey>>;
  * @public
  * @docid
  */
-export interface dxTreeViewOptions<TKey = any>
-    extends Omit<HierarchicalCollectionWidgetOptions<dxTreeView<TKey>, dxTreeViewItem, TKey>, 'dataSource'>, SearchBoxMixinOptions {
+export interface dxTreeViewOptions<TItem extends ItemLike = any, TKey = any>
+    extends Omit<HierarchicalCollectionWidgetOptions<dxTreeView<TItem, TKey>, TItem, TKey>, 'dataSource'>, SearchBoxMixinOptions {
     /**
      * @docid
      * @default true
@@ -193,14 +195,14 @@ export interface dxTreeViewOptions<TKey = any>
      * @type_function_return Promise<any>|Array<Object>
      * @public
      */
-    createChildren?: ((parentNode: Node<TKey>) => PromiseLike<any> | Array<any>);
+    createChildren?: ((parentNode: Node<TItem, TKey>) => PromiseLike<any> | Array<any>);
     /**
      * @docid
      * @type string | Array<dxTreeViewItem> | Store | DataSource | DataSourceOptions | null
      * @default null
      * @public
      */
-    dataSource?: DataSourceLike<Item, TKey> | null;
+    dataSource?: DataSourceLike<TItem, TKey> | null;
     /**
      * @docid
      * @default 'tree'
@@ -243,7 +245,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @type Array<dxTreeViewItem>
      * @public
      */
-    items?: Array<Item>;
+    items?: Array<TItem>;
     /**
      * @docid
      * @default null
@@ -252,7 +254,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemClick?: ((e: ItemClickEvent<TKey>) => void);
+    onItemClick?: ((e: ItemClickEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -260,7 +262,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemCollapsed?: ((e: ItemCollapsedEvent<TKey>) => void);
+    onItemCollapsed?: ((e: ItemCollapsedEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -268,7 +270,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemContextMenu?: ((e: ItemContextMenuEvent<TKey>) => void);
+    onItemContextMenu?: ((e: ItemContextMenuEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -276,7 +278,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemExpanded?: ((e: ItemExpandedEvent<TKey>) => void);
+    onItemExpanded?: ((e: ItemExpandedEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -284,7 +286,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemHold?: ((e: ItemHoldEvent<TKey>) => void);
+    onItemHold?: ((e: ItemHoldEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -292,7 +294,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemRendered?: ((e: ItemRenderedEvent<TKey>) => void);
+    onItemRendered?: ((e: ItemRenderedEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -300,7 +302,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onItemSelectionChanged?: ((e: ItemSelectionChangedEvent<TKey>) => void);
+    onItemSelectionChanged?: ((e: ItemSelectionChangedEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -308,7 +310,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @action
      * @public
      */
-    onSelectAllValueChanged?: ((e: SelectAllValueChangedEvent<TKey>) => void);
+    onSelectAllValueChanged?: ((e: SelectAllValueChangedEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default null
@@ -317,7 +319,7 @@ export interface dxTreeViewOptions<TKey = any>
      * @public
      * @override
      */
-    onSelectionChanged?: ((e: SelectionChangedEvent<TKey>) => void);
+    onSelectionChanged?: ((e: SelectionChangedEvent<TItem, TKey>) => void);
     /**
      * @docid
      * @default 'parentId'
@@ -399,8 +401,8 @@ export interface dxTreeViewOptions<TKey = any>
  * @namespace DevExpress.ui
  * @public
  */
-export default class dxTreeView<TKey = any>
-    extends HierarchicalCollectionWidget<dxTreeViewOptions<TKey>, dxTreeViewItem, TKey> {
+export default class dxTreeView<TItem extends ItemLike = any, TKey = any>
+    extends HierarchicalCollectionWidget<dxTreeViewOptions<TItem, TKey>, TItem, TKey> {
     /**
      * @docid
      * @publicName collapseAll()
@@ -411,11 +413,10 @@ export default class dxTreeView<TKey = any>
      * @docid
      * @publicName collapseItem(itemData)
      * @param1 itemData:dxTreeViewItem
-     * @param1_field items:Array<dxTreeViewItem>
      * @return Promise<void>
      * @public
      */
-    collapseItem(itemData: Item): DxPromise<void>;
+    collapseItem(itemData: TItem): DxPromise<void>;
     /**
      * @docid
      * @publicName collapseItem(itemElement)
@@ -440,11 +441,10 @@ export default class dxTreeView<TKey = any>
      * @docid
      * @publicName expandItem(itemData)
      * @param1 itemData:dxTreeViewItem
-     * @param1_field items:Array<dxTreeViewItem>
      * @return Promise<void>
      * @public
      */
-    expandItem(itemData: Item): DxPromise<void>;
+    expandItem(itemData: TItem): DxPromise<void>;
     /**
      * @docid
      * @publicName expandItem(itemElement)
@@ -465,14 +465,14 @@ export default class dxTreeView<TKey = any>
      * @public
      * @return Array<dxTreeViewNode>
      */
-    getNodes(): Array<Node<TKey>>;
+    getNodes(): Array<Node<TItem, TKey>>;
     /**
      * @docid
      * @publicName getSelectedNodes()
      * @public
      * @return Array<dxTreeViewNode>
      */
-    getSelectedNodes(): Array<Node<TKey>>;
+    getSelectedNodes(): Array<Node<TItem, TKey>>;
     /**
      * @docid
      * @publicName getSelectedNodeKeys()
@@ -496,10 +496,9 @@ export default class dxTreeView<TKey = any>
      * @docid
      * @publicName selectItem(itemData)
      * @param1 itemData:dxTreeViewItem
-     * @param1_field items:Array<dxTreeViewItem>
      * @public
      */
-    selectItem(itemData: Item): boolean;
+    selectItem(itemData: TItem): boolean;
     /**
      * @docid
      * @publicName selectItem(itemElement)
@@ -522,10 +521,9 @@ export default class dxTreeView<TKey = any>
      * @docid
      * @publicName unselectItem(itemData)
      * @param1 itemData:dxTreeViewItem
-     * @param1_field items:Array<dxTreeViewItem>
      * @public
      */
-    unselectItem(itemData: Item): boolean;
+    unselectItem(itemData: TItem): boolean;
     /**
      * @docid
      * @publicName unselectItem(itemElement)
@@ -549,11 +547,10 @@ export default class dxTreeView<TKey = any>
      * @docid
      * @publicName scrollToItem(itemData)
      * @param1 itemData:dxTreeViewItem
-     * @param1_field items:Array<dxTreeViewItem>
      * @return Promise<void>
      * @public
      */
-    scrollToItem(itemData: Item): DxPromise<void>;
+    scrollToItem(itemData: TItem): DxPromise<void>;
     /**
      * @docid
      * @publicName scrollToItem(itemElement)
@@ -621,8 +618,6 @@ export interface dxTreeViewItem extends CollectionWidgetItem {
      * @public
      */
     selected?: boolean;
-
-    [key: string]: any;
 }
 
 /**
@@ -630,7 +625,7 @@ export interface dxTreeViewItem extends CollectionWidgetItem {
  * @docid dxTreeViewNode
  * @type object
  */
-export type Node<TKey = any> = dxTreeViewNode<TKey>;
+export type Node<TItem extends ItemLike = any, TKey = any> = dxTreeViewNode<TItem, TKey>;
 
 /**
  * @docid
@@ -638,13 +633,13 @@ export type Node<TKey = any> = dxTreeViewNode<TKey>;
  * @type object
  * @namespace DevExpress.ui
  */
-export interface dxTreeViewNode<TKey = any> {
+export interface dxTreeViewNode<TItem extends ItemLike = any, TKey = any> {
     /**
      * @docid
      * @public
      * @type Array<dxTreeViewNode>;
      */
-    children?: Array<dxTreeViewNode<TKey>>;
+    children?: Array<dxTreeViewNode<TItem, TKey>>;
     /**
      * @docid
      * @public
@@ -660,7 +655,7 @@ export interface dxTreeViewNode<TKey = any> {
      * @public
      * @type dxTreeViewItem
      */
-    itemData?: Item;
+    itemData?: TItem;
     /**
      * @docid
      * @public
@@ -671,7 +666,7 @@ export interface dxTreeViewNode<TKey = any> {
      * @public
      * @type dxTreeViewNode
      */
-    parent?: dxTreeViewNode<TKey>;
+    parent?: dxTreeViewNode<TItem, TKey>;
     /**
      * @docid
      * @public
@@ -688,29 +683,29 @@ export interface dxTreeViewNode<TKey = any> {
 export type Scrollable = Omit<dxScrollable, '_templateManager' | '_cancelOptionChange' | '_getTemplate' | '_invalidate' | '_refresh' | '_notifyOptionChanged' | '_createElement'>;
 
 /** @public */
-export type ExplicitTypes<TKey = any> = {
-    Properties: Properties<TKey>;
-    Node: Node<TKey>;
-    ContentReadyEvent: ContentReadyEvent<TKey>;
-    DisposingEvent: DisposingEvent<TKey>;
-    InitializedEvent: InitializedEvent<TKey>;
-    ItemClickEvent: ItemClickEvent<TKey>;
-    ItemCollapsedEvent: ItemCollapsedEvent<TKey>;
-    ItemContextMenuEvent: ItemContextMenuEvent<TKey>;
-    ItemExpandedEvent: ItemExpandedEvent<TKey>;
-    ItemHoldEvent: ItemHoldEvent<TKey>;
-    ItemRenderedEvent: ItemRenderedEvent<TKey>;
-    ItemSelectionChangedEvent: ItemSelectionChangedEvent<TKey>;
-    OptionChangedEvent: OptionChangedEvent<TKey>;
-    SelectAllValueChangedEvent: SelectAllValueChangedEvent<TKey>;
-    SelectionChangedEvent: SelectionChangedEvent<TKey>;
+export type ExplicitTypes<TItem extends ItemLike = any, TKey = any> = {
+    Properties: Properties<TItem, TKey>;
+    Node: Node<TItem, TKey>;
+    ContentReadyEvent: ContentReadyEvent<TItem, TKey>;
+    DisposingEvent: DisposingEvent<TItem, TKey>;
+    InitializedEvent: InitializedEvent<TItem, TKey>;
+    ItemClickEvent: ItemClickEvent<TItem, TKey>;
+    ItemCollapsedEvent: ItemCollapsedEvent<TItem, TKey>;
+    ItemContextMenuEvent: ItemContextMenuEvent<TItem, TKey>;
+    ItemExpandedEvent: ItemExpandedEvent<TItem, TKey>;
+    ItemHoldEvent: ItemHoldEvent<TItem, TKey>;
+    ItemRenderedEvent: ItemRenderedEvent<TItem, TKey>;
+    ItemSelectionChangedEvent: ItemSelectionChangedEvent<TItem, TKey>;
+    OptionChangedEvent: OptionChangedEvent<TItem, TKey>;
+    SelectAllValueChangedEvent: SelectAllValueChangedEvent<TItem, TKey>;
+    SelectionChangedEvent: SelectionChangedEvent<TItem, TKey>;
 };
 
 /** @public */
-export type Properties<TKey = any> = dxTreeViewOptions<TKey>;
+export type Properties<TItem extends ItemLike = any, TKey = any> = dxTreeViewOptions<TItem, TKey>;
 
 /** @deprecated use Properties instead */
-export type Options<TKey = any> = Properties<TKey>;
+export type Options<TItem extends ItemLike = any, TKey = any> = Properties<TItem, TKey>;
 
 /// #DEBUG
 // eslint-disable-next-line import/first
diff --git a/packages/devextreme/ts/dx.all.d.ts b/packages/devextreme/ts/dx.all.d.ts
index 16c4b9cff3c0..1aa640d702b7 100644
--- a/packages/devextreme/ts/dx.all.d.ts
+++ b/packages/devextreme/ts/dx.all.d.ts
@@ -31550,9 +31550,12 @@ declare module DevExpress.ui {
   /**
    * [descr:dxTreeView]
    */
-  export class dxTreeView<TKey = any> extends HierarchicalCollectionWidget<
-    dxTreeViewOptions<TKey>,
-    dxTreeViewItem,
+  export class dxTreeView<
+    TItem extends DevExpress.ui.dxTreeView.ItemLike = any,
+    TKey = any
+  > extends HierarchicalCollectionWidget<
+    dxTreeViewOptions<TItem, TKey>,
+    TItem,
     TKey
   > {
     /**
@@ -31562,9 +31565,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeView.collapseItem(itemData)]
      */
-    collapseItem(
-      itemData: DevExpress.ui.dxTreeView.Item
-    ): DevExpress.core.utils.DxPromise<void>;
+    collapseItem(itemData: TItem): DevExpress.core.utils.DxPromise<void>;
     /**
      * [descr:dxTreeView.collapseItem(itemElement)]
      */
@@ -31580,9 +31581,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeView.expandItem(itemData)]
      */
-    expandItem(
-      itemData: DevExpress.ui.dxTreeView.Item
-    ): DevExpress.core.utils.DxPromise<void>;
+    expandItem(itemData: TItem): DevExpress.core.utils.DxPromise<void>;
     /**
      * [descr:dxTreeView.expandItem(itemElement)]
      */
@@ -31594,11 +31593,11 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeView.getNodes()]
      */
-    getNodes(): Array<DevExpress.ui.dxTreeView.Node<TKey>>;
+    getNodes(): Array<DevExpress.ui.dxTreeView.Node<TItem, TKey>>;
     /**
      * [descr:dxTreeView.getSelectedNodes()]
      */
-    getSelectedNodes(): Array<DevExpress.ui.dxTreeView.Node<TKey>>;
+    getSelectedNodes(): Array<DevExpress.ui.dxTreeView.Node<TItem, TKey>>;
     /**
      * [descr:dxTreeView.getSelectedNodeKeys()]
      */
@@ -31614,7 +31613,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeView.selectItem(itemData)]
      */
-    selectItem(itemData: DevExpress.ui.dxTreeView.Item): boolean;
+    selectItem(itemData: TItem): boolean;
     /**
      * [descr:dxTreeView.selectItem(itemElement)]
      */
@@ -31630,7 +31629,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeView.unselectItem(itemData)]
      */
-    unselectItem(itemData: DevExpress.ui.dxTreeView.Item): boolean;
+    unselectItem(itemData: TItem): boolean;
     /**
      * [descr:dxTreeView.unselectItem(itemElement)]
      */
@@ -31646,9 +31645,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeView.scrollToItem(itemData)]
      */
-    scrollToItem(
-      itemData: DevExpress.ui.dxTreeView.Item
-    ): DevExpress.core.utils.DxPromise<void>;
+    scrollToItem(itemData: TItem): DevExpress.core.utils.DxPromise<void>;
     /**
      * [descr:dxTreeView.scrollToItem(itemElement)]
      */
@@ -31662,89 +31659,107 @@ declare module DevExpress.ui {
     /**
      * [descr:_ui_tree_view_ContentReadyEvent]
      */
-    export type ContentReadyEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>>;
+    export type ContentReadyEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>>;
     /**
      * [descr:_ui_tree_view_DisposingEvent]
      */
-    export type DisposingEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>>;
-    export type ExplicitTypes<TKey = any> = {
-      Properties: Properties<TKey>;
-      Node: Node<TKey>;
-      ContentReadyEvent: ContentReadyEvent<TKey>;
-      DisposingEvent: DisposingEvent<TKey>;
-      InitializedEvent: InitializedEvent<TKey>;
-      ItemClickEvent: ItemClickEvent<TKey>;
-      ItemCollapsedEvent: ItemCollapsedEvent<TKey>;
-      ItemContextMenuEvent: ItemContextMenuEvent<TKey>;
-      ItemExpandedEvent: ItemExpandedEvent<TKey>;
-      ItemHoldEvent: ItemHoldEvent<TKey>;
-      ItemRenderedEvent: ItemRenderedEvent<TKey>;
-      ItemSelectionChangedEvent: ItemSelectionChangedEvent<TKey>;
-      OptionChangedEvent: OptionChangedEvent<TKey>;
-      SelectAllValueChangedEvent: SelectAllValueChangedEvent<TKey>;
-      SelectionChangedEvent: SelectionChangedEvent<TKey>;
+    export type DisposingEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>>;
+    export type ExplicitTypes<TItem extends ItemLike = any, TKey = any> = {
+      Properties: Properties<TItem, TKey>;
+      Node: Node<TItem, TKey>;
+      ContentReadyEvent: ContentReadyEvent<TItem, TKey>;
+      DisposingEvent: DisposingEvent<TItem, TKey>;
+      InitializedEvent: InitializedEvent<TItem, TKey>;
+      ItemClickEvent: ItemClickEvent<TItem, TKey>;
+      ItemCollapsedEvent: ItemCollapsedEvent<TItem, TKey>;
+      ItemContextMenuEvent: ItemContextMenuEvent<TItem, TKey>;
+      ItemExpandedEvent: ItemExpandedEvent<TItem, TKey>;
+      ItemHoldEvent: ItemHoldEvent<TItem, TKey>;
+      ItemRenderedEvent: ItemRenderedEvent<TItem, TKey>;
+      ItemSelectionChangedEvent: ItemSelectionChangedEvent<TItem, TKey>;
+      OptionChangedEvent: OptionChangedEvent<TItem, TKey>;
+      SelectAllValueChangedEvent: SelectAllValueChangedEvent<TItem, TKey>;
+      SelectionChangedEvent: SelectionChangedEvent<TItem, TKey>;
     };
     /**
      * [descr:_ui_tree_view_InitializedEvent]
      */
-    export type InitializedEvent<TKey = any> =
-      DevExpress.common.core.events.InitializedEventInfo<dxTreeView<TKey>>;
+    export type InitializedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.InitializedEventInfo<
+      dxTreeView<TItem, TKey>
+    >;
     /**
      * [descr:_ui_tree_view_ItemClickEvent]
      */
-    export type ItemClickEvent<TKey = any> =
-      DevExpress.common.core.events.NativeEventInfo<
-        dxTreeView<TKey>,
-        KeyboardEvent | MouseEvent | PointerEvent
-      > &
-        ItemInfo<TKey>;
+    export type ItemClickEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.NativeEventInfo<
+      dxTreeView<TItem, TKey>,
+      KeyboardEvent | MouseEvent | PointerEvent
+    > &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:_ui_tree_view_ItemCollapsedEvent]
      */
-    export type ItemCollapsedEvent<TKey = any> =
-      DevExpress.common.core.events.NativeEventInfo<
-        dxTreeView<TKey>,
-        MouseEvent | PointerEvent
-      > &
-        ItemInfo<TKey>;
+    export type ItemCollapsedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.NativeEventInfo<
+      dxTreeView<TItem, TKey>,
+      MouseEvent | PointerEvent
+    > &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:_ui_tree_view_ItemContextMenuEvent]
      */
-    export type ItemContextMenuEvent<TKey = any> =
-      DevExpress.common.core.events.NativeEventInfo<
-        dxTreeView<TKey>,
-        MouseEvent | PointerEvent | TouchEvent
-      > &
-        ItemInfo<TKey>;
+    export type ItemContextMenuEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.NativeEventInfo<
+      dxTreeView<TItem, TKey>,
+      MouseEvent | PointerEvent | TouchEvent
+    > &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:_ui_tree_view_ItemExpandedEvent]
      */
-    export type ItemExpandedEvent<TKey = any> =
-      DevExpress.common.core.events.NativeEventInfo<
-        dxTreeView<TKey>,
-        MouseEvent | PointerEvent
-      > &
-        ItemInfo<TKey>;
+    export type ItemExpandedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.NativeEventInfo<
+      dxTreeView<TItem, TKey>,
+      MouseEvent | PointerEvent
+    > &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:_ui_tree_view_ItemHoldEvent]
      */
-    export type ItemHoldEvent<TKey = any> =
-      DevExpress.common.core.events.NativeEventInfo<
-        dxTreeView<TKey>,
-        MouseEvent | PointerEvent | TouchEvent
-      > &
-        ItemInfo<TKey>;
+    export type ItemHoldEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.NativeEventInfo<
+      dxTreeView<TItem, TKey>,
+      MouseEvent | PointerEvent | TouchEvent
+    > &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:_ui_tree_view_ItemInfo]
      * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.
      */
-    export interface ItemInfo<TKey = any> {
+    export interface ItemInfo<TItem extends ItemLike = any, TKey = any> {
       /**
        * [descr:_ui_tree_view_ItemInfo.itemData]
        */
-      readonly itemData?: Item;
+      readonly itemData?: TItem;
       /**
        * [descr:_ui_tree_view_ItemInfo.itemElement]
        */
@@ -31756,31 +31771,47 @@ declare module DevExpress.ui {
       /**
        * [descr:_ui_tree_view_ItemInfo.node]
        */
-      readonly node?: Node<TKey>;
+      readonly node?: Node<TItem, TKey>;
     }
+    /**
+     * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.
+     */
+    type ItemLike = string | Item | any;
     /**
      * [descr:_ui_tree_view_ItemRenderedEvent]
      */
-    export type ItemRenderedEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>> &
-        ItemInfo<TKey>;
+    export type ItemRenderedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>> &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:_ui_tree_view_ItemSelectionChangedEvent]
      */
-    export type ItemSelectionChangedEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>> &
-        ItemInfo<TKey>;
+    export type ItemSelectionChangedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>> &
+      ItemInfo<TItem, TKey>;
     /**
      * [descr:dxTreeViewNode]
      */
-    export type Node<TKey = any> = dxTreeViewNode<TKey>;
+    export type Node<TItem extends ItemLike = any, TKey = any> = dxTreeViewNode<
+      TItem,
+      TKey
+    >;
     /**
      * [descr:_ui_tree_view_OptionChangedEvent]
      */
-    export type OptionChangedEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>> &
-        DevExpress.common.core.events.ChangedOptionInfo;
-    export type Properties<TKey = any> = dxTreeViewOptions<TKey>;
+    export type OptionChangedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>> &
+      DevExpress.common.core.events.ChangedOptionInfo;
+    export type Properties<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = dxTreeViewOptions<TItem, TKey>;
     export type Scrollable = Omit<
       dxScrollable,
       | '_templateManager'
@@ -31794,18 +31825,22 @@ declare module DevExpress.ui {
     /**
      * [descr:_ui_tree_view_SelectAllValueChangedEvent]
      */
-    export type SelectAllValueChangedEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>> & {
-        /**
-         * [descr:_ui_tree_view_SelectAllValueChangedEvent.value]
-         */
-        readonly value?: boolean | undefined;
-      };
+    export type SelectAllValueChangedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>> & {
+      /**
+       * [descr:_ui_tree_view_SelectAllValueChangedEvent.value]
+       */
+      readonly value?: boolean | undefined;
+    };
     /**
      * [descr:_ui_tree_view_SelectionChangedEvent]
      */
-    export type SelectionChangedEvent<TKey = any> =
-      DevExpress.common.core.events.EventInfo<dxTreeView<TKey>>;
+    export type SelectionChangedEvent<
+      TItem extends ItemLike = any,
+      TKey = any
+    > = DevExpress.common.core.events.EventInfo<dxTreeView<TItem, TKey>>;
     export type TreeViewCheckBoxMode = 'none' | 'normal' | 'selectAll';
     export type TreeViewExpandEvent = 'dblclick' | 'click';
   }
@@ -31842,19 +31877,20 @@ declare module DevExpress.ui {
      * [descr:dxTreeViewItem.selected]
      */
     selected?: boolean;
-
-    [key: string]: any;
   }
   /**
    * [descr:dxTreeViewNode]
    * @deprecated [depNote:dxTreeViewNode]
    * @deprecated Attention! This type is for internal purposes only. If you used it previously, please submit a ticket to our {@link https://supportcenter.devexpress.com/ticket/create Support Center}. We will check if there is an alternative solution.
    */
-  export interface dxTreeViewNode<TKey = any> {
+  export interface dxTreeViewNode<
+    TItem extends DevExpress.ui.dxTreeView.ItemLike = any,
+    TKey = any
+  > {
     /**
      * [descr:dxTreeViewNode.children]
      */
-    children?: Array<dxTreeViewNode<TKey>>;
+    children?: Array<dxTreeViewNode<TItem, TKey>>;
     /**
      * [descr:dxTreeViewNode.disabled]
      */
@@ -31866,7 +31902,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeViewNode.itemData]
      */
-    itemData?: DevExpress.ui.dxTreeView.Item;
+    itemData?: TItem;
     /**
      * [descr:dxTreeViewNode.key]
      */
@@ -31874,7 +31910,7 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeViewNode.parent]
      */
-    parent?: dxTreeViewNode<TKey>;
+    parent?: dxTreeViewNode<TItem, TKey>;
     /**
      * [descr:dxTreeViewNode.selected]
      */
@@ -31888,11 +31924,13 @@ declare module DevExpress.ui {
    * [descr:dxTreeViewOptions]
    * @deprecated [depNote:dxTreeViewOptions]
    */
-  export interface dxTreeViewOptions<TKey = any>
-    extends Omit<
+  export interface dxTreeViewOptions<
+    TItem extends DevExpress.ui.dxTreeView.ItemLike = any,
+    TKey = any
+  > extends Omit<
         HierarchicalCollectionWidgetOptions<
-          dxTreeView<TKey>,
-          dxTreeViewItem,
+          dxTreeView<TItem, TKey>,
+          TItem,
           TKey
         >,
         'dataSource'
@@ -31906,15 +31944,12 @@ declare module DevExpress.ui {
      * [descr:dxTreeViewOptions.createChildren]
      */
     createChildren?: (
-      parentNode: DevExpress.ui.dxTreeView.Node<TKey>
+      parentNode: DevExpress.ui.dxTreeView.Node<TItem, TKey>
     ) => PromiseLike<any> | Array<any>;
     /**
      * [descr:dxTreeViewOptions.dataSource]
      */
-    dataSource?: DevExpress.data.DataSourceLike<
-      DevExpress.ui.dxTreeView.Item,
-      TKey
-    > | null;
+    dataSource?: DevExpress.data.DataSourceLike<TItem, TKey> | null;
     /**
      * [descr:dxTreeViewOptions.dataStructure]
      */
@@ -31942,56 +31977,60 @@ declare module DevExpress.ui {
     /**
      * [descr:dxTreeViewOptions.items]
      */
-    items?: Array<DevExpress.ui.dxTreeView.Item>;
+    items?: Array<TItem>;
     /**
      * [descr:dxTreeViewOptions.onItemClick]
      */
-    onItemClick?: (e: DevExpress.ui.dxTreeView.ItemClickEvent<TKey>) => void;
+    onItemClick?: (
+      e: DevExpress.ui.dxTreeView.ItemClickEvent<TItem, TKey>
+    ) => void;
     /**
      * [descr:dxTreeViewOptions.onItemCollapsed]
      */
     onItemCollapsed?: (
-      e: DevExpress.ui.dxTreeView.ItemCollapsedEvent<TKey>
+      e: DevExpress.ui.dxTreeView.ItemCollapsedEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.onItemContextMenu]
      */
     onItemContextMenu?: (
-      e: DevExpress.ui.dxTreeView.ItemContextMenuEvent<TKey>
+      e: DevExpress.ui.dxTreeView.ItemContextMenuEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.onItemExpanded]
      */
     onItemExpanded?: (
-      e: DevExpress.ui.dxTreeView.ItemExpandedEvent<TKey>
+      e: DevExpress.ui.dxTreeView.ItemExpandedEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.onItemHold]
      */
-    onItemHold?: (e: DevExpress.ui.dxTreeView.ItemHoldEvent<TKey>) => void;
+    onItemHold?: (
+      e: DevExpress.ui.dxTreeView.ItemHoldEvent<TItem, TKey>
+    ) => void;
     /**
      * [descr:dxTreeViewOptions.onItemRendered]
      */
     onItemRendered?: (
-      e: DevExpress.ui.dxTreeView.ItemRenderedEvent<TKey>
+      e: DevExpress.ui.dxTreeView.ItemRenderedEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.onItemSelectionChanged]
      */
     onItemSelectionChanged?: (
-      e: DevExpress.ui.dxTreeView.ItemSelectionChangedEvent<TKey>
+      e: DevExpress.ui.dxTreeView.ItemSelectionChangedEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.onSelectAllValueChanged]
      */
     onSelectAllValueChanged?: (
-      e: DevExpress.ui.dxTreeView.SelectAllValueChangedEvent<TKey>
+      e: DevExpress.ui.dxTreeView.SelectAllValueChangedEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.onSelectionChanged]
      */
     onSelectionChanged?: (
-      e: DevExpress.ui.dxTreeView.SelectionChangedEvent<TKey>
+      e: DevExpress.ui.dxTreeView.SelectionChangedEvent<TItem, TKey>
     ) => void;
     /**
      * [descr:dxTreeViewOptions.parentIdExpr]