Last Updated: 14 Apr 2022 11:00 by ADMIN
Created by: Joel Kraft
Comments: 1
Category: DateRangePicker
Type: Bug Report

Error thrown:
Uncaught Sys.InvalidOperationException: Sys.InvalidOperationException: 'maxDate' is not a property or an existing field.

Setup for reproduction:

<asp:ScriptManager runat="server" ID="ScriptManager1"></asp:ScriptManager>

<telerik:RadDateRangePicker runat="server" ID="RadDateRangePicker1"
MinDate="2022-05-01" MaxDate="2022-05-01">

Last Updated: 12 Apr 2022 11:41 by ADMIN
If the FileExplorer is located inside a container with position "absolute" or "fixed" the Scrolling mechanism breaks.
Last Updated: 31 Mar 2022 08:24 by Revanth
Created by: Revanth
Comments: 0
Category: ComboBox
Type: Bug Report
In general, disabled Controls get grayed out and turn inaccessible. Disabling the ComboBox using the set_enabled(false) would prevent users to interact with the ComboBox, but will not have a "disabled" style applied.
Last Updated: 22 Mar 2022 13:04 by Swapnil
Created by: Swapnil
Comments: 0
Category: FileExplorer
Type: Bug Report

It is not possible to select a Toolbar item in RadFileExplorer on Enter press if the control is used in Lightweight render mode.

Steps to reproduce:

1. Open https://demos.telerik.com/aspnet-ajax/fileexplorer/examples/keyboardsupport/defaultcs.aspx

2. Press "Ctrl+f2" to focus RadFileExplorer

3. Press "Shift+1" to focus its toolbar

4. Use the Arrow keys to navigate between to Toolbar items

5. Press Enter over a button (e.g. Upload)

Result: The command is not triggered


Workaround: The issue is not reproducible in Classic render mode.

Last Updated: 18 Mar 2022 09:06 by ADMIN
Created by: Kevin
Comments: 1
Category: Grid
Type: Bug Report

I've used the Telerik Themebuilder to create a css file for the grid and set up my application to use the theme.  This is working however, there are many classes that are not being output by the themebuilder.  For instance, the buttons on the pager don't work.


Last Updated: 17 Mar 2022 16:19 by Swapnil

It is not possible to navigate between ContextMenu items with the arrow keys when the Keyboard support is enabled.

The ThreeView remains the focused element even after the ContextMenu is shown and using the arrow keys navigates through the tree nodes instead of the ContextMenu items.

Steps to reproduce.

  1. Click somewhere on the page and press "F" for focus FileExplorer
  2. Press "T" to focus TreeView
  3. Press "C" to show tree context menu
  4. Pres Up/down arrow to navigate through the context menu items

Result: The navigation occurs in the three instead of the Context menu

            <telerik:RadFileExplorer ID="RadFileExplorer1" Height="380px" Width="750px"
                AllowPaging="false" EnableCopy="true" runat="server">
                <Configuration EnableAsyncUpload="true" SearchPatterns="*.*" UploadPaths="~/Images/" DeletePaths="~/Images/" ViewPaths="~/Images/"></Configuration>

Last Updated: 09 Mar 2022 15:06 by ADMIN
Created by: John
Comments: 0
Category: DateRangePicker
Type: Bug Report


When RadDateRangePicker has StartDatePicker-AutoPostBack and EndDatePicker-AutoPostBack set to "true", after postback when focusing the end date: the days from ending month are not selected in the calendar.

They are selected on the left side, but not on the right side. Is this intended behavior? 

Code excerpt:

<telerik:RadDateRangePicker ID="rdrpDateRange" runat="server" StartDatePicker-AutoPostBack="true" EndDatePicker-AutoPostBack="true" />

Thank you.

Last Updated: 24 Feb 2022 14:03 by Manikantha

Settings to reproduce the problem:

  <telerik:RadGrid ID="RadGrid1" runat="server" AllowPaging="True" Width="800px" OnNeedDataSource="RadGrid1_NeedDataSource">
                <Scrolling AllowScroll="true" UseStaticHeaders="true" />
            <MasterTableView  InsertItemDisplay="Bottom"
After pressing Add new record - The Insert Item is rendered in the same <table> element as the Pager is. It is overflowing the Grid and it is not scrollable:




Last Updated: 07 Feb 2022 13:41 by Swapnil

FileExplorer does not scroll its tree properly to the programatically selected folders.

Steps to reproduce:

1. Set a nested folder with a long path programatically:


2. Select another nested folder programatically:


Result: The second folder is selected, but the TreeView does not properly scroll into view containing it.

Last Updated: 01 Feb 2022 09:23 by ADMIN
Created by: Andrew
Comments: 3
Category: Editor
Type: Bug Report


I am contacting you today to let you know I have found cross-site scripting vectors within the latest version of the RadEditor. I have attached images of the payloads that seem to bypass the XSS filter.

The second payload only works on Firefox browsers, but the first works on Chrome browsers too. While it still requires users to click on the link to trigger XSS, it can be easily social engineered in most situations.

Last Updated: 21 Jan 2022 07:00 by Andrea
Last Updated: 11 Jan 2022 15:49 by ADMIN

The row selection in RadGrid is not proper if the row is deselected via the checkbox, while the Shift button is pressed.

Steps to reproduce the problem:

  1. Open https://demos.telerik.com/aspnet-ajax/grid/examples/columns-rows/columns/column-types/defaultcs.aspx
  2. Select first row of the grid.
  3. Press SHIFT key and click up to 4th rows.
  4. Uncheck checkbox of third row while SHIFT key is pressed.
  5. You can see all the rows below third row becomes deselected.
  6. But the current row is still highlighted with checkbox unchecked.

Last Updated: 03 Jan 2022 12:25 by ADMIN
Created by: Rolf Falnes
Comments: 1
Category: Grid
Type: Bug Report
We're having problems using GenerateXlsxOutput and ExportSettings.IgnorePaging.
When ExportSettings.IgnorePaging is true the grid's paging disappears after exporting.

We're using Asp.Net Ajax version 2021.3.1111.45.
Last Updated: 21 Dec 2021 09:35 by David Stacey
The horizontal scrollbar is not visible in iOS when the grid is empty.

Code to reproduce the problem:
        html, body, body > form {
            height: 100%;
            padding: 0;
            margin: 0;
        <telerik:RadGrid ID="RadGrid1" runat="server" AllowPaging="True" Width="100%"
                <Scrolling AllowScroll="true" />
            <MasterTableView Width="1500px">

    protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
        (sender as RadGrid).DataSource = GetData();

    private object GetData()
        DataTable dt = new DataTable();

        //dt.Rows.Add(1, 2, 3, 4, 5, 6, 7, 8);

        return dt;
Last Updated: 20 Dec 2021 09:59 by ADMIN

TreeView context menu remains visible when a permission alert is shown. I should be hidden like the Grid contect menu is.



Steps to reproduce:

1. Copy a file from the Grid in RadFileExplorer

2. Right click over the same directory in the TreeView and select Paste



Last Updated: 14 Dec 2021 09:56 by ADMIN
Created by: Aaron
Comments: 1
Category: ListBox
Type: Bug Report

Enabling/Disabling the ListBox on the client is not persisted across PostBacks.

To replicate the issue

ListBox markup

<telerik:RadListBox runat="server" ID="RadListBoxA" CheckBoxes="true" Enabled="false">
        <telerik:RadListBoxItem Text="Item 1" />
        <telerik:RadListBoxItem Text="Item 2" />
        <telerik:RadListBoxItem Text="Item 3" />
        <telerik:RadListBoxItem Text="Item 4" />

<telerik:RadButton runat="server" ID="RadButton1" Text="Toggle State" AutoPostBack="false" OnClientClicked="ToggleListBoxStates" />
<telerik:RadButton runat="server" ID="RadButton2" Text="Postback" AutoPostBack="true" />


OnClientClicked event handler

function ToggleListBoxStates(sender, args) {
    var listBoxA = $find("<%= RadListBoxA.ClientID %>");

Run the example, change the ListBox state and do a PostBack.

Notice, the state changes back.

Last Updated: 03 Dec 2021 12:59 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: 29 Nov 2021 16:21 by ADMIN
PopupDirection property of RadDateRangePicker has no effect.
Last Updated: 25 Nov 2021 18:38 by ADMIN
Created by: Theo
Comments: 0
Category: Diagram
Type: Bug Report

RadDiagram does not render stroke thinner than 2px.

Code to reproduce:

        <telerik:RadDiagram ID="webDiagram" runat="server">
                <telerik:DiagramShape Id="s1">
                    <StrokeSettings Width="1" Color="grey" />

Actual result:

Expected result:

Last Updated: 23 Nov 2021 11:33 by ADMIN
Created by: Peter
Comments: 0
Category: Grid
Type: Bug Report

These issues can be reproduced here:


1. Navigate to the above site on an iOS device (IPhone or IPad).

2. Touch the top right hamburger menu to open the Columns Display Form. 

3. Touch a checkbox.

The first touch over a checkbox or its corresponding label is not changing the state of the checkbox but at the same time, the header buttons are switched to Done and Cancel (as if changes have been made).

Touching between separate column fields changes the state of the checkbox of the upper column but the same is not updating the header buttons (Back button remains visible and Done and Cancel remain hidden).

Video of reproduction - http://somup.com/crX0Q80F0j.

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