Last Updated: 17 Sep 2019 10:26 by ADMIN
Hello guys,


We've faced an issue with menu on several RAD controls when running on MacOS 10.14.x (Mojave) with FireFox 66.0.x (Quantum).

Using touchpad or mouse, when right clicking for context menu, it just flashed and doesn't stay open: it opens and then suddenly closes.

We are using Telerik Asp.Net Ajax version 2017.2.503.40 but it can be also replicated on your demo version:

Not sure if you can provide a fast workaround for this but I just wanted to let you know.

I've checked for some open cases before creating this thread and hope I didn't duplicate something. Please move/close it if necessary.



Andrei V.
Last Updated: 09 Sep 2019 10:58 by ADMIN

Hover over the command arrows on the radScheduler when the view is set to month view.  The Tooltip will display "next day" and "previous day" instead of "next month" and "previous month".

The same happens for week view.

Temporary workaround: 

<telerik:RadCodeBlock runat="server">
        function pageLoadHandler() {
            var scheduler = $find("<%= RadScheduler1.ClientID %>");
            var $scheduler = $telerik.$(scheduler.get_element());
            var viewType = "Day";
            if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.WeekView) {
                viewType = "Week";
            } else if (scheduler.get_selectedView() == Telerik.Web.UI.SchedulerViewType.MonthView) {
                viewType = "Month";

            $scheduler.find(".rsPrevDay").attr("title", "Previous " + viewType)
            $scheduler.find(".rsNextDay").attr("title", "Next " + viewType)

            // Sys.Application.remove_load(pageLoadHandler);  

Last Updated: 03 Sep 2019 16:56 by ADMIN

The Pencil dialog is not positioned properly when the image is zoomed or/and scrolled.

Steps to reproduce:

1. Open
2. Zoom the image to 200%
3. Scroll the image to the right
4. Open the pencil dialog

Result - the dialog appears outside the visible area
Last Updated: 05 Aug 2019 09:43 by ADMIN

The role=textbox is set to the wrapper element instead of the input element itself. That confuses the screen readers such as JAWS, which leads to the Form Fields dialog to skip them. 

As a temporary workaround, the role of the wrapper element with class RadInput can be set to "presentation"

    function pageLoadHandler() {
        $telerik.$(".RadInput").attr("role", "presentation")
        // Sys.Application.remove_load(pageLoadHandler);  

Or using the following script: 

var WebARIAHelper = (function ($) {

  // Assign default ARIA roles to desired elements
  function AssignDefaultARIARoles(element) {
    element = (element || document.body);

    // TFS 110547 - Mark SPAN/DIV around RadInput elements as presentation to avoid confusing JAWS form field dialog
    $("span.RadInput, div.RadInput", element).attr("role", "presentation");
  // Handle AJAX EndRequest event to process any new content
  function WebARIAHelperEndRequestHandler(sender, args) {
    if (args.get_error() == null) {
      // Make sure all page controls can finish their ready event processes before looking at DOM
      window.setTimeout(function () {
      }, 10);
  $(function () {
    // Make sure all page controls can finish their ready event processes before looking at DOM
    window.setTimeout(function () {
    }, 10);

    if (window.Sys && Sys.WebForms && Sys.WebForms.PageRequestManager) {
      var instance = Sys.WebForms.PageRequestManager.getInstance();
      if (instance) instance.add_endRequest(WebARIAHelperEndRequestHandler);

  return null;
)($ || $telerik.$);

Last Updated: 02 Aug 2019 10:12 by ADMIN
Only the selected tab has an aria-selected attribute. According to the documentation I can find, all tabs should have aria-selected, and be set to true or  false as appropriate.

aria-selected (state)§

Indicates the current "selected" state of various widgets. See related aria-checked and aria-pressed.

This attribute is used with single-selection and multiple-selection widgets:

  1. Single-selection containers where the currently focused item is not selected. The selection normally follows the focus, and is managed by the user agent.
  2. Multiple-selection containers. Authors SHOULD ensure that any selectable descendant of a container in which the aria-multiselectable attribute is true specifies a value of either true or false for the aria-selected attribute.

Any explicit assignment of aria-selected takes precedence over the implicit selection based on focus. If no DOM element in the widget is explicitly marked as selected, assistive technologies MAY convey implicit selection which follows the keyboard focus of the managed focus widget. If any DOM element in the widget is explicitly marked as selected, the user agent MUST NOT convey implicit selection for the widget.

Used in Roles:
Inherits into Roles:
falseThe selectable element is not selected.
trueThe selectable element is selected.
undefined (default)The element is not selectable.
Last Updated: 01 Aug 2019 18:12 by ADMIN
When you have both a Detail Item Template and a Detail Table inside a Grid and then when you show a hidden column using the context menu it only shows for the first row and the grid doesn't display properly.  It also throws the javasecript error "Unable to get property '_getVisibleColumnsCount' of undefined or null reference".
Last Updated: 30 Jul 2019 14:35 by ADMIN

Images with "*.jpeg" extension are saved as "*.jpg" in a different file even if the "Overwrite" option is checked. 

Steps to reproduce:

1. Open an image with "*.jpeg" extension in ImageEditor (e.g. test.JPEG)
2. Edit the image
3. Open the Save Dialog and choose "Save Image On Server" with checked "Overwrite if file exists?" option

Result: The edited image is saved as a new files with jpg extension (e.g. test.jpg)

Last Updated: 11 Jul 2019 14:35 by ADMIN

I have an AutoCompleteBox that cuts off the last letter of the default message.

This only happens on load and in Mozilla FireFox.

After the user focuses the AutoCompleteBox and loses focuses the full default message is available.

It seems that this is related to the inability of FireFox to handle the size property of the input elements. On initial load, the input is sized by setting the size property of the input. 

A possible workaround would be calling the internal _updateInputSize method in the OnClientLoad event of the AutoCompleteBox: 

function OnClientLoad(sender, args) {
    if (Telerik.Web.Browser.ff) {

Last Updated: 10 Jul 2019 15:56 by ADMIN
I have found that there is a bug when working with tables in the editor in inline editing mode in Safari on Mac -

In the normal editing mode, you can edit the table properties by right clicking inside the table to get the context menu, then choose table properties, add row etc.

In Inline editing mode, it shows the context menu but when you click on any item it says to select the table. None of the other context menu commands like inserting rows etc work.

I have tested on your demo site and you should be able to simulate it there.
Last Updated: 10 Jul 2019 08:00 by ADMIN
When the server's timezone is set to UTC-2 and timezones with bigger negative offset (e.g.  (UTC-08:00) Pacific Time (US & Canada) and (UTC-07:00) Mountain Time (US & Canada)) the appointments on July 1st at 1:30AM are not rendered.
Last Updated: 26 Jun 2019 09:25 by ADMIN

There is a bug with combining scripts and resources:

Combined CDN Request for Telerik Controls

You can reproduce the issue in the attached web site sample.

Last Updated: 21 Jun 2019 06:54 by ADMIN

RadClientDataSource does not update the data properly when bound to EntityDataSource. The proper data is displayed only of first load (when the data is fetched via, but not after an update (e.g. a page change)

Steps to reproduce:

  1. Open
  2. Do either one of the following
     - Change to page 2 and go back to page 1
     - Hitting refresh loses all data
     - Edit multiple values before saving -> many of them are lost
     - Upon save, the old data reappears before being updated.

Result - the Grid is not bound with the correct data

Last Updated: 14 Jun 2019 08:50 by ADMIN
Created by: Thomas
Comments: 1
Category: SearchBox
Type: Bug Report
The Tooltip property of the SearchBoxButton in the Buttons collection of the RadSearchBox is not rendered on the button element client-side.
Last Updated: 07 Jun 2019 07:13 by ADMIN
Created by: Telerik Admin
Comments: 0
Category: FormDecorator
Type: Bug Report
 FireFox 65 again changed its behavior and breaks the behavior of our 2019 R1 SP1 release., introducing a fix for the following bug:

If you are using the controls from 2019 R1 SP1 or later, you can use the following workaround in order to make the input elements visible until we include the fix internally:

<style> .t-ff input[type=checkbox].rfdRealInput, .t-ff input[type=radio].rfdRealInput { position: static; } </style>

Last Updated: 05 Jun 2019 14:44 by ADMIN
Created by: pranav
Comments: 0
Category: Editor
Type: Bug Report
The dopdowns of the tools in the Editor's toolbar are shown below the video objects in the Editor's content area in IE 11.


Steps to reproduce:

1. Open in IE 11:

2.  Insert a video through the Media Manager

3. Click over a tool having a drop-down menu (e.g. the Format tool)

Result: The heavy-weight object of the video is shown above the shown drop-down menu.

Last Updated: 05 Jun 2019 11:26 by ADMIN


I enabled the ShowButton property to the radtextbox, but while writing and the words reach the button I can't see the final of the text. 

<telerik:RadTextBox ID="RadTextBox1" runat="server" ShowButton="true"></telerik:RadTextBox>

If I disable the ShowButton and write something in the radtextbox, I can see the final words. 

How I can fix this? 


Last Updated: 27 May 2019 15:13 by ADMIN
Created by: Randy
Comments: 1
Category: UI for ASP.NET AJAX
Type: Bug Report

I have a RadCheckboxList In an ASP Panel. When Enabling/Disabling the panel the CheckBoxList does not Enable/Disable.  I tested this with a simple mock up with additional controls that work as expected:


<asp:Panel ID="TestPanel" runat="server" Enabled="true">

<telerik:RadCheckBoxList ID="WeeklyDays" runat="server" Columns="4" AutoPostBack="false">


<telerik:ButtonListItem Text="Monday" Value="2" />

<telerik:ButtonListItem Text="Tuesday" Value="4" />

<telerik:ButtonListItem Text="Wednesday" Value="8" />

<telerik:ButtonListItem Text="Thursday" Value="16" />

<telerik:ButtonListItem Text="Friday" Value="32" />

<telerik:ButtonListItem Text="Saturday" Value="64" />

<telerik:ButtonListItem Text="Sunday" Value="1" Selected="true" />



<telerik:RadTextBox ID="TestText" runat="server"></telerik:RadTextBox>

<telerik:RadDatePicker ID="TestDate" runat="server"></telerik:RadDatePicker>


<br />

<telerik:RadCheckBox ID="ToggleEnabled" runat="server" Text="Toggle Panel" AutoPostBack="true" Checked="true" OnCheckedChanged="ToggleEnabled_CheckedChanged"></telerik:RadCheckBox>



 protected voidToggleEnabled_CheckedChanged(objectsender, EventArgs e)


TestPanel.Enabled = Convert.ToBoolean(ToggleEnabled.Checked);


Last Updated: 17 May 2019 06:57 by ADMIN
Created by: Kasim
Comments: 3
Category: PivotGrid
Type: Bug Report

The code in the ASPx file is 

 <DataCellStyle CssClass="cfDataCell" Width="9%"/>

The expected output in the client browser is

 <tr style="height: 35px;">
        <td class="rpgDataCell cfDataCell" style="width:9%;">823</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">2,488</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">7,518</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">10,851</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">13,017</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">13,069</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">13,253</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">12,799</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">9,861</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">4,543</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">2,038</td>
        <td class="rpgDataCell cfDataCell" style="width:9%;">592</td>

However the generated Html is as below:

 <tr style="height: 35px;">
        <td class="rpgDataCell" style="width:9%;">823</td>
        <td class="rpgDataCell" style="width:9%;">2,488</td>
        <td class="rpgDataCell" style="width:9%;">7,518</td>
        <td class="rpgDataCell" style="width:9%;">10,851</td>
        <td class="rpgDataCell" style="width:9%;">13,017</td>
        <td class="rpgDataCell" style="width:9%;">13,069</td>
        <td class="rpgDataCell" style="width:9%;">13,253</td>
        <td class="rpgDataCell" style="width:9%;">12,799</td>
        <td class="rpgDataCell" style="width:9%;">9,861</td>
        <td class="rpgDataCell" style="width:9%;">4,543</td>
        <td class="rpgDataCell" style="width:9%;">2,038</td>
        <td class="rpgDataCell" style="width:9%;">592</td>

Last Updated: 09 May 2019 07:55 by ADMIN
We are using the Telerik tabStrip ASP.NET AJAX control.

We have set PerTabScrolling="true" on the tabStrip.

Then we have hidden a tab on the client side that is apart of the tabstrip.

Now when we scroll to the end of the list we receive a JavaScript error: Sys.InvalidOperationException: Cannot serialize non finite numbers.

This only happens when we hide a tab.

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