Grids: Add W1028 error description (#7907) (#7973)

Author: arman-boyakhchyan

api-reference/10 UI Components/Errors and Warnings/W1028.md

@@ -3,7 +3,11 @@ id: ErrorsUIWidgets.W1028
 ---
 ---
 ##### shortDescription
-<!-- Description goes here -->
+Occurs in the DataGrid and TreeList components when an unsupported property is defined in a banded/nested column.
 
 ---
-<!-- Description goes here -->
+Do not specify the following properties for banded/nested columns: [fixed](/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#fixed), [fixedPosition](/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#fixedPosition), [type](/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/#type), and [buttons](/Documentation/ApiReference/UI_Components/dxDataGrid/Configuration/columns/buttons/).
+
+#####See Also#####
+
+- [DataGrid - Band Columns](/Documentation/Guide/UI_Components/DataGrid/Columns/Column_Types/Band_Columns/)