Last Updated: 13 May 2022 18:18 by ADMIN
Release LIB 2022.2.516 (16 May 2022)
The RadTabItem elements are not correctly displayed with long values set to the Header property when the TabOrientation="Vertical" and the used theme is Office2019.
Last Updated: 11 Aug 2021 15:47 by Petar
The DropDownContentTemplate is not applied to items in the dropdown menu that are dynamically added. 
Last Updated: 22 Mar 2021 07:13 by ADMIN
Release LIB 2021.1.322
This happens if you use the DropDownOpened event of RadTabControl in order to reorder the DropDownItemsSource of the event arguments. In this case, the synchronization of the selection between the drop down and the tab items is broken.

To work this around, you can disable the default overflow button and implement a custom one in the AdditionalContent of RadTabControl. Check the attached project for a sample implementation.
Last Updated: 27 Nov 2020 14:34 by ADMIN
Release LIB 2020.3.1130 (11/30/2020)
The Align property is not respected in the following themes: Windows8Touch, Office2019
Last Updated: 21 Sep 2020 08:25 by ADMIN
Pressing the Home and End keys selects the first/last items even if they are collapsed/hidden.
Last Updated: 30 Jul 2020 08:42 by ADMIN
The scroll buttons are visible when the visible area is enough to display all tabs and the TabStripPlacement is set to Left/Right.
Won't Fix
Last Updated: 12 May 2020 08:22 by Hans
Tab selection does not work in the VS designer when switching between different views.
Won't Fix
Last Updated: 06 Mar 2020 10:49 by ADMIN
If you define two UserControls in a project and you add two RadTabControls - one RadTabControl per UserControl, then in design-time you can only change the selection of one of the tab components.
Last Updated: 03 Dec 2019 14:08 by ADMIN
Introduce "Add new tab" button as in the RadTabbedWindow control which creates a new tab upon click.
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: 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: 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: 14 Oct 2019 10:44 by ADMIN
Release LIB 2019.3.1014
Last Updated: 11 Jun 2019 10:03 by ADMIN
Release R2 2019 SP1
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: 30 May 2019 08:27 by ADMIN

When the window of an application that has a TabControl with Left/Right TabStripPlacement is resized, the measure of the TabStrip is incorrect and the ScrollButtons are in Disabled state. All Tabs should be visible when the window is in its normal state and should be scrollable.
Possible workaround:
Inherit RadTabControl and override

  protected override void OnScrollButtonsVisibilityChanged()
            if (this.ScrollViewer != null)
                RadDockPanel parentDock = this.ScrollViewer.Parent as RadDockPanel;
                if (parentDock != null)
                    // Dispatcher is because Measure should be called outside other Measure phase.
                    this.Dispatcher.BeginInvoke(new Action(() =>
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: 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: 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.
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