Last Updated: 25 Nov 2019 12:03 by ADMIN
Release LIB 2019.3.1125

Drag and drop from Visual Studio Toolbox to the designer area doesn't allow you to drop the corresponding control inside the content of the selected tab item. 

To work this around, add a Grid panel with transparent background inside the RadTabItem's in XAML. You can do this also  through the toolbox.

 <telerik:RadTabItem x:Name="RadTabItem1" Header="Tab item 1">
	<Grid Background="Transparent" />

Last Updated: 14 Oct 2019 11:05 by ADMIN
Release LIB 2019.3.1014

TabControl's TabItems aren't properly updated on attempt to change the theme palette variation runtime until any of the items is selected. Check the following video -

There are several possible workarounds which include:

  • Clearing all merged resource dictionaries and re-merging them
  • Increasing and decreasing the height of the MainWindow by 1 after loading the chosen palette to force the refresh
Last Updated: 06 Jun 2019 06:50 by ADMIN
Release LIB 2019.2.610 (06/10/2019)
In R2 2019 there is a regression bug in RadTabControl.
Clicking with mouse middle button over a tab removes it from the Items collection.
Workaround: In R2 2019 or for particular items, user can handle PreviewMouseDown event of the RadTabItem and if the pressed button is middle - handle the event. 
private void RadTabItem_PreviewMouseDown(object sender, MouseButtonEventArgs e)
           if (e.ChangedButton == MouseButton.Middle)
               e.Handled = true;
Last Updated: 11 Jun 2019 10:03 by ADMIN
Release R2 2019 SP1
Last Updated: 22 May 2019 11:25 by ADMIN
Release LIB 2019.2.527 (05/27/2019)
A design time error occurs when referencing NoXaml assemblies. 
The error message is the following: "Cannot find resource named 'RadButtonStyle'. Resource names are case sensitive."
Last Updated: 31 Jan 2019 12:09 by ADMIN
error appears when the control is placed inside a RadTabItem

Scheduled for:
The fix for this issue will be available with LIB (version 2019.1.204) scheduled for publishing on Monday, 4th February 2019.
Last Updated: 14 Oct 2019 10:44 by ADMIN
Release LIB 2019.3.1014
Last Updated: 28 Oct 2019 11:04 by ADMIN
Release LIB 2019.3.1028
Created by: Petar Mladenov
Comments: 2
Category: TabControl
Type: Bug Report
When you select the RadTabItems via Keyboard or Mouse, Narrator or other Accessibility tools like NVDA do no read the selected tab.

This is a bug in the RadTabControlAutomaitonPeer / RadTabItemAutomationPeer's code.

Usually screen readers read "Selected Tab One", "Selected Tab 2". This is how MS TabControl is read actually.

Last Updated: 12 Feb 2019 16:05 by ADMIN
When pressing the Alt key, the access key of a given element must be displayed. Inside the Header of a TabItem it is not. The issue is not reproducible with the standard MS TabItem. It seems that it is related to the Foreground binding of the control. There is a workaround as shown below.

    <telerik:RadTabItem >
                <AccessText Text="_Tab 1"
                            Foreground="{Binding RelativeSource={RelativeSource AncestorType=telerik:RadTabItem},
Last Updated: 12 Nov 2014 09:24 by ADMIN
Fixed in LIB version: 2014.3.1103
Last Updated: 09 Nov 2018 09:13 by ADMIN
When you have the TabStripPlacement property set to something other than Top and you try to hide the TabControl border by setting the BorderThickness property to 0. The border is still shown. If you have TabStripPlacement set to Top the border disappears.

As a workaround set the BorderBrush property of the RadTabControl to "Transparent".
Last Updated: 08 Mar 2018 09:17 by ADMIN
Scrolling in TabStrip does not work well when TabStripPlacement=Left or Bottom and  ScrollMode=Item. Pressing the Scroll Buttons scrolls the entire set of tabs.
Last Updated: 16 May 2016 10:32 by Konstantin
Prism View is incorrectly initialized when associated with a region

We have created a SDK sample with a CustomRegionAdapter for the RadTabControl and its implementation can be found in out SDK repository(
Last Updated: 10 Mar 2017 06:43 by joan miquel fernandez cañadas
The TabItem doesn't changes when selected Item in the VS2010 designer.

The issue is present also in the VS2008 and Blend.