Approved
Last Updated: 21 Aug 2019 10:38 by ADMIN

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 - https://www.screencast.com/t/jMj0EZqFfy.

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
Completed
Last Updated: 11 Jun 2019 10:03 by ADMIN
Release R2 2019 SP1
Completed
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;
           }
       }
Approved
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(() =>
                    {
                        parentDock.InvalidateMeasure();
                    }));
                }
            }
        }
 
 
Completed
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."
Completed
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:RadTabControl>
    <telerik:RadTabItem >
        <telerik:RadTabItem.Header>
            
                <AccessText Text="_Tab 1"
                            Foreground="{Binding RelativeSource={RelativeSource AncestorType=telerik:RadTabItem},
                            Path=Foreground}"/>
        </telerik:RadTabItem.Header>
    </telerik:RadTabItem>
</telerik:RadTabControl>
Completed
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.
Completed
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".
Approved
Last Updated: 20 Apr 2018 12:35 by Vladimir
ADMIN
Created by: Vladimir Stoyanov
Comments: 0
Category: TabControl
Type: Bug Report
1

			
Approved
Last Updated: 20 Mar 2018 16:03 by ADMIN
ADMIN
Created by: Petar Mladenov
Comments: 2
Category: TabControl
Type: Bug Report
2
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.

Completed
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.
Approved
Last Updated: 08 Feb 2018 11:50 by ADMIN
Won't Fix
Last Updated: 29 Mar 2017 14:06 by ADMIN
Exceptions are occuring on ALL bindings, not just with RelativeSource

Command="{Binding AddCommand}"

will also raise an exception.
Approved
Last Updated: 17 Mar 2017 14:36 by ADMIN
Completed
Last Updated: 10 Mar 2017 06:43 by joan miquel fernandez cañadas
The TabItem doesn't changes when selected Item in the VS2010 designer.

UPDATE:
The issue is present also in the VS2008 and Blend.
Won't Fix
Last Updated: 23 Jan 2017 12:23 by ADMIN
When the SelectedIndex property is read during animation the CLR wrapper will throw InvalidCastException because of invalid cast to int. The object returned from GetValue is DeferredReference object.
Approved
Last Updated: 04 Jan 2017 14:34 by Anthony
Created by: Anthony
Comments: 1
Category: TabControl
Type: Bug Report
1
In version 2016.2.613.45 of the Office2013 Theme, there is a problem in the control template for the RadTabControl. The ContentBorder element properly gets it's BorderThickness from the TemplatedParent, but the PlacementStates VisualStates override it with hard-coded Thickness (0,1,1,1 in the case of the "Left" Visual State) in their storyboards rather than doing an appropriate transform of the Thickness. This makes it impossible to override the BorderThickness for the control in any state other than the default layout without copying and replacing the entire control template. This appears to be a change in behavior since the (Februray 2016?) release, but I cannot be sure as the old theme files were uninstalled during the upgrade and the telerik.windows.controls.navigation.baml file is not properly decompiled in JustDecompile.
Approved
Last Updated: 03 Jan 2017 21:24 by ADMIN
Workaround: Set HorizontalScrollBarVisibility property to Visible in order to show the scrollbar: 
<telerik:RadTabControl ScrollViewer.HorizontalScrollBarVisibility="Visible" .../>

or use Loaded event of TabControl and change the Height in order to trigger SizeChanged:
private void xTab_Loaded(object sender, RoutedEventArgs e)
{
    this.Height++;
    this.Height--;
}
1 2 3