Last Updated: 27 Jan 2023 08:24 by Mauro
Created by: Mauro
Comments: 0
Category: Grid
Type: Bug Report

Resizing a column in the Grid Leads to resizing of the Grid wrapper along with the GroupPanel. The problem can be replicated with the following Resizing settings:

<Resizing AllowColumnResize="true" AllowRowResize="true" EnableRealTimeResize="true" ResizeGridOnColumnResize="false" EnableNextColumnResize="true"/>

The issue occurs only on certain Screen sizes, or when the browser/display has some zoom applied.

Last Updated: 24 Jan 2023 07:47 by Development
We have noticed a bug in the latest version of Telerik Controls (2023.1.117). We need to disable/enable toolbar in certain circumstances by code to avoid that the user push buttons.

We are using ItemTemplates with RadButtons inside.

Disabling the toolbar is possible but when we reenable the toolbar the buttons remain disabled.
Version 2022.3.1109 worked.

At the moment we are using a workaround and enable/disable not the toolbar but with a foreach the buttons in the itemtemplate directly, but this is unfortunately very cumbersome.

Reproduction code:
<script runat="server">
protected void OnCLick(object sender, EventArgs e)
	Test.Items[0].Enabled = !Test.Items[0].Enabled;

	Response.Write("Button is " + Test.Items[0].Enabled);

<telerik:RadScriptManager ID="MainRSM" runat="server" EnableScriptCombine="true" EnableCdn="false" AsyncPostBackTimeout="500" EnableEmbeddedjQuery="true" OutputCompression="AutoDetect" />
<telerik:RadToolBar Id="Test" runat="server">
				<telerik:RadButton runat="server" Text="Test" />

<telerik:RadButton runat="server" Text="Enable/Disable button" OnClick="OnCLick" />

Last Updated: 13 Jan 2023 11:56 by ADMIN
Release R1 2023

Code & steps to replicate the issue.

  1. At the initial load, the TargetButton is enabled.
  2. Click the "Toggle Enabled State and Do PostBack" which will disable the button using the set_enabled property and do a PostBack. 
  3. Click again on the "Toggle Enabled State and Do PostBack" to enable the TargetButton and do another PostBack.
  4. While the TargetButton gets enabled via JavaScript, the server still renders the Button as disabled after the PostBack.
<telerik:RadButton runat="server" ID="RadButton1" Text="Target Button" AutoPostBack="true" EnableViewState="true" />
<br />
<br />
<telerik:RadButton runat="server" ID="RadButton2" Text="Toggle Enabled State and Do PostBack" OnClientClicked="toggleEnabledState" AutoPostBack="true" />

    function toggleEnabledState(sender, args) {
        var radButton1 = $find("<%=   RadButton1.ClientID %>");

Last Updated: 12 Jan 2023 08:28 by ADMIN
Release R1 2023

Using the latest 2022.3.1109.45, our web application is catching "Invalid Resource Request" exceptions when the Windows7 or Vista (maybe others too) loads the "Editor" control in "Classic" mode.    By decoding the URL, the control is having problems locating the image below

Error Message: This is an invalid webresource request.



Change the skin of the radeditor in the default.aspx to another skin such as "metro" and the problem will not happen.    It works OK at least on Black, Metro and Silk but haven't tested others, you can tell it doesn't work when the divider bars in the editor toolbar don't appear properly.

Last Updated: 11 Jan 2023 15:43 by n/a

When a big number of items are bound to RadGrid on the server side and Virtualization is enabled paging to the last item is not working as expected.

The problem can be reproduced with the setup in the following demo:

Increasing the number of Customers bound to the Grid to more than 1000000 leads to the problem.

Last Updated: 10 Jan 2023 16:27 by Ricardo
Created by: Ricardo
Comments: 0
Category: Window
Type: Bug Report

The Window will not open in the center of the screen if it was already opened once and the page has been scrolled. It seems that the Window keeps opening at the same position initially was opened, hence it could open out of screen bounds.

Steps & Code for Reproduction


  1. Copy/Paste the Code from below and Load the page
  2. Click on the Button, the Window will open at the center
  3. Scroll toward the top of the page until the button is barely visible
  4. Click the button again. At this point, the Window will open out of the screen boundaries, in its initial position



    .mydiv {
        margin: 2000px 100px;

<telerik:RadWindow ID="RadWindow1" runat="server">
        <h3>RadWindow1 Content</h3>

    function ShowEditForm(sender, args) {
        var wnd = $find("<%= RadWindow1.ClientID %>");
    Sys.Application.add_load(function () {
        setTimeout(function () {
        }, 100)

<div class="mydiv">
    <telerik:RadButton runat="server" ID="RadButton1" Text="OpenWindow" AutoPostBack="false" OnClientClicked="ShowEditForm" />

Last Updated: 28 Dec 2022 13:08 by ADMIN
Created by: Marin Bratanov
Comments: 1
Category: Button
Type: Bug Report

select an item from the dropdown, different than "1" expected: buttons become enabled actual: radbutton is still disabled

<asp:Button ID="ButtonTest" runat="server" enabled="true" Text="Test" EnableViewState="False" />
<telerik:RadPushButton ID="RadButtonTest" runat="server" Text="RadButtonTest" Enabled="True" EnableViewState="False" RenderMode="Lightweight"></telerik:RadPushButton>
<asp:DropDownList runat="server" ID="DropDownTest" AutoPostBack="True" OnSelectedIndexChanged="SelectedIndexChanged_Test">
        <asp:ListItem Text="1" Value="1"></asp:ListItem>
        <asp:ListItem Text="2" Value="2"></asp:ListItem>
        <asp:ListItem Text="3" Value="3"></asp:ListItem>
        <asp:ListItem Text="4" Value="4"></asp:ListItem>


protected void Page_LoadComplete(object sender, EventArgs e)
    if (DropDownTest.SelectedValue == "1")
        ButtonTest.Enabled = false;
        RadButtonTest.Enabled = false;
        string script = string.Format("function f(){{$find('{0}').set_enabled({1});Sys.Application.remove_load(f);}}Sys.Application.add_load(f);",
        ScriptManager.RegisterStartupScript(Page, Page.GetType(), "someKey", script, true);

protected void SelectedIndexChanged_Test(object sender, EventArgs e)

Last Updated: 20 Dec 2022 10:01 by ADMIN


<telerik:RadStyleSheetManager runat="server"></telerik:RadStyleSheetManager>

<asp:UpdatePanel runat="server">
        <asp:Button Text="Postback" OnClick="Unnamed_Click" runat="server" />
        <telerik:RadButton runat="server" Visible="false" ID="RadButton1" Text="Telerik button" AutoPostBack="true" />

protected void Unnamed_Click(object sender, EventArgs e)
    RadButton1.Visible = true;

<add key="Telerik.ScriptManager.EnableHandlerEncryption" value="true" />



Temporarily set EnableHandlerEncryption to false or do not use a StyleSheetManager

<add key="Telerik.ScriptManager.EnableHandlerEncryption" value="false" />

Last Updated: 19 Dec 2022 09:04 by ADMIN
Created by: Bharani
Comments: 3
Category: NuGet feed
Type: Bug Report


i am getting below error when i try to build my solution in VS2019. Please help how this can be fixed.


Last Updated: 15 Dec 2022 17:11 by ADMIN
When having at least one hidden column and the AllowColumnResize is set to true, the table cells in the DetailItemTemplate do not get the correct colspan value, hence braking the table structure.
Last Updated: 13 Dec 2022 13:08 by David
Created by: David
Comments: 0
Category: TabStrip
Type: Bug Report

AXE Errors:

  • Frames must have title attribute - Element location: iframe[src$="content.aspx"]
  • Elements must only use allowed ARIA attributes - Element location: #RadTabStrip1

Setup to reproduce:

<telerik:RadTabStrip runat="server" ID="RadTabStrip1" MultiPageID="RadMultiPage1" EnableAriaSupport="true" SelectedIndex="0">
    <AriaSettings Label="TabStrip" />
    <KeyboardNavigationSettings CommandKey="Alt" FocusKey="M" />
        <telerik:RadTab Text="Tab 1">
        <telerik:RadTab Text="Tab 2">

<telerik:RadMultiPage runat="server" ID="RadMultiPage1" SelectedIndex="0" EnableAriaSupport="true">
    <telerik:RadPageView ID="RadPageView1" runat="server" ContentUrl="content.aspx">
    <telerik:RadPageView ID="RadPageView2" runat="server" ContentUrl="content.aspx">

Last Updated: 12 Dec 2022 16:58 by ADMIN
Release R1 2023


I can't tell you how long we've racked our brains trying to figure this issue out. We are using the Bootstrap theme for RadListView and are doing drag and drop. We've been getting a "This is an invalid webresource request. " error when first dragging an item on the page.

I just came across this article which provided me some new guidance:

And we decrypted the querystring of the WebResource request and it is looking for this:


When we change our RadListView skin to "Default" or "Black", this drag and drop error is gone so there clearly must be a broken link/reference for that image because we also see the little drag and drop cross overlaying the items we are dragging.

Thank you,


Last Updated: 24 Nov 2022 11:16 by ADMIN
Due to recent changes to the keyboard accessibility of the RadMenu (i.e. it is now only accessible using the arrow keys instead of moving around using tabs), mega menus are no longer keyboard accessible.

We have designed a mega menu using a telerik RadSiteMap embedded in a RadMenu control, as suggested in the Telerik Demo site: http://demos.telerik.com/aspnet-ajax/menu/examples/megadropdown/defaultcs.aspx

However, this is no longer accessible. Previously, you could open the dropdown by pressing the down button, then move around in the dropdown using tab. Now, however, pressing tab just closes the dropdown.

We need the menu to be accessible in one way or another.
Last Updated: 22 Nov 2022 12:12 by ADMIN
You can workaround this issue with the following CSS rule.

    div.RadGrid .t-font-icon{
        font: 16px/1 "TelerikWebUI";
Last Updated: 21 Nov 2022 14:46 by ADMIN
In earlier versions of the editor, the css class was applied to the image tag itself, which is the correct way to do it. Otherwise the applied css class has no effect on the image.
Last Updated: 17 Nov 2022 11:55 by ADMIN

The editor does not work at all in Chrome for iOS.

You can reproduce it in this demo:





Last Updated: 26 Oct 2022 14:48 by ADMIN
Scheduled for R3 2022 SP1
Created by: Peter
Comments: 1
Category: MultiSelect
Type: Bug Report

RadMultiselect control has ClearButton property which should enable displaying the button for clearing all the selected options...

However, eventhough I have this property turned on I don't see any button for clearing the values...  I can only go to the "expected" position for the button and then my mouse cursor is changed and after clicking all the values are cleared as expected... 

Last Updated: 26 Oct 2022 14:33 by ADMIN
Release R3 2022 SP1

RadComboBox Bootstrap Lightweight skin is not loading in version 2022.3.913

Workarounds provided by Admin:

Option 1

Use RadStyleSheetManager to load the correct stylesheet from Telerik.Web.UI.Skins assembly, as per the instructions in Skin registration with RadStyleSheetManager:

<telerik:RadStyleSheetManager runat="server" ID="RadStyleSheetManager">
            <telerik:StyleSheetReference Name="Telerik.Web.UI.Skins.BootstrapLite.ComboBOx.Bootstrap.css" Assembly="Telerik.Web.UI.Skins" />

Option 2

Link the correct stylesheet manually on the page in one of the following ways:

Last Updated: 25 Oct 2022 09:04 by ADMIN
Release R3 2022 SP1
Created by: Alvin
Comments: 1
Category: FloatingActionButton
Type: Bug Report
The order of the items is reversed when the FloatingActionButton's position is set to BottomEnd and there is a PdfViewer on the page.
Need More Info
Last Updated: 20 Oct 2022 08:23 by ADMIN


I'm facing JavaScript issues after enabling "Telerik.ScriptManager.EnableHandlerEncryption" on Web.config,

I've just followed Encrypt Telerik WebResource Querystring in order to hide the Telerik version.

After this the RadMenu breaks when i do a PostBack action (by pressing a button), the console outputs the same error when hovering a RadMenuItem and the submenus has stop being displayed.

The console error:

Uncaught TypeError: Cannot read properties of null (reading 'apply')
  at Type.callBaseMethod (Telerik.Web.UI.WebRe...=:6:7353)
  at c.RadMenuItem._createChildControls (Telerik.Web.UI.WebRe...=:5300:49)
  at c.RadMenuItem._ensureChildControls (Telerik.Web.UI.WebRe...=:2770:72)
  at c.RadMenuItem._getChildren (Telerik.Web.UI.WebRe...=:2768:32)
  at c.RadMenuItem.get_items (Telerik.Web.UI.WebRe...=:3552:36)
  at c.RadMenuItem._onItemMouseOver (Telerik.Web.UI.WebRe...=:4159:8)
  at Telerik.Web.UI.EventMap._onDomEvent (Telerik.Web.UI.WebRe...=:3289:6)
  at HTMLDivElement.<anonymous> (Telerik.Web.UI.WebRe...=:6:307)
  at HTMLDivElement.b (Telerik.Web.UI.WebRe...=:623:53)

I've tested this error with version 2020.2.617.45 and 2022.3.913 but the same problem.

Looking in the forum i've found this post with a related issue also a reply has a reference to a private feedback and this last one seems to be the same or almost the same problem, so i've tried to follow the workaround on "global.asax" file and "Page_Load" on the master page without luck.

The steps i've follow:

  • Enabling "Telerik.ScriptManager.EnableHandlerEncryption".
  • Site seems working correctly.
  • I press a RadButton inside a RadAjaxPane.
  • Response from server is OK.
  • Then i hover the cursor on RadMenuItems on RadMenu.
  • Console starts to show the related error explaining above.
  • RadMenu stops to present the submenus completely.

I'd like to have another way to workaround this in order to make RadMenu work properly again and keep Telerik version hidden.


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