Added new kb article radiogroup-readonly (#3104)

Co-authored-by: KB Bot <[email protected]>

Author: kendo-bot

knowledge-base/radiogroup-readonly.md

@@ -0,0 +1,78 @@
+---
+title: Readonly RadioGroup
+description: Learn how to make the Telerik RadioGroup for Blazor readonly without graying out the text.
+type: how-to
+page_title: How to Customize Telerik RadioGroup for Blazor to Be Readonly Without Graying Out
+meta_title: How to Customize Telerik RadioGroup for Blazor to Be Readonly Without Graying Out
+slug: radiogroup-kb-readonly
+tags: radiogroup, blazor, readonly
+res_type: kb
+ticketid: 1690650
+---
+
+## Environment
+
+<table>
+    <tbody>
+        <tr>
+            <td>Product</td>
+            <td>RadioGroup for Blazor</td>
+        </tr>
+    </tbody>
+</table>
+
+## Description
+
+I want to make the [RadioGroup](slug:radiogroup-overview) readonly but keep the text visually clear (not grayed out). Using the `Enabled` property disables the input entirely but also makes the text and radio buttons gray, which reduces readability.
+
+## Solution
+
+To make the TelerikRadioGroup readonly without graying out the text, use the following CSS approach:
+
+````Razor
+<style>
+    .k-radio-list li .k-radio-wrap {
+        pointer-events: none; /* Prevents mouse interactions */
+        opacity: 0.5; /* Makes it look visually disabled */
+        cursor: not-allowed;
+    }
+
+    .k-radio-list li label {
+        pointer-events: none; /* Prevents mouse interactions */
+        cursor: not-allowed;
+    }
+</style>
+
+Chosen delivery method: @(ChosenDeliveryMethod == 0 ? "no selection yet" : ChosenDeliveryMethod.ToString())
+<br />
+
+<TelerikRadioGroup Data="@DeliveryOptions"
+                   @bind-Value="@ChosenDeliveryMethod"
+                   ValueField="@nameof(DeliveryMethodModel.MethodId)"
+                   TextField="@nameof(DeliveryMethodModel.MethodText)">
+</TelerikRadioGroup>
+
+@code {
+    private int ChosenDeliveryMethod { get; set; }
+
+    private List<DeliveryMethodModel> DeliveryOptions { get; set; } = new List<DeliveryMethodModel>
+    {
+        new DeliveryMethodModel { MethodId = 1, MethodText = "Standard Shipping" },
+        new DeliveryMethodModel { MethodId = 2, MethodText = "Express Shipping" },
+        new DeliveryMethodModel { MethodId = 3, MethodText = "In-Store Pickup" },
+        new DeliveryMethodModel { MethodId = 4, MethodText = "Curbside Pickup" },
+    };
+
+    public class DeliveryMethodModel
+    {
+        public int MethodId { get; set; }
+        public string MethodText { get; set; }
+    }
+}
+````
+
+## See Also
+
+* [RadioGroup Documentation](slug:radiogroup-overview)
+* [CSS pointer-events Property](https://developer.mozilla.org/en-US/docs/Web/CSS/pointer-events)
+* [RadioGroup Binding](slug:radiogroup-databind)