How to Auto Size the Tab Items From TabbedWindow

Environment

Product Version	2019.2.618
Product	RadTabbedWindow for WPF

Description

How to auto size the RadTabItem headers in RadTabbedWindow, instead of showing a scrollbar.

Solution

Change the the default ItemsPanel of RadTabbedWindow to TabStripPanel. You can do this in the Loaded event handler of RadTabbedWindow.

<Window.Resources> 
    <ItemsPanelTemplate x:Key="tabControlPanel">             
        <primitives:TabStripPanel /> 
    </ItemsPanelTemplate> 
</Window.Resources> 

Where primitives points to xmlns:primitives="clr-namespace:Telerik.Windows.Controls.Primitives;assembly=Telerik.Windows.Controls.Navigation"

private void OpenTabbedWindow() 
{ 
    var tabbedWindow = new RadTabbedWindow(); 
    tabbedWindow.Width = 600; 
    tabbedWindow.Height = 400; 
    tabbedWindow.Loaded += OnRadTabbedWindowLoaded;             
    tabbedWindow.ItemsPanel = (ItemsPanelTemplate)this.Resources["tabControlPanel"]; 
    for (int i = 0; i < 10; i++) 
    { 
        tabbedWindow.Items.Add(new RadTabItem() { Header = "Item " + i, MaxWidth = 100 }); 
    } 
    tabbedWindow.Show();             
} 
 
private void OnRadTabbedWindowLoaded(object sender, RoutedEventArgs e) 
{ 
    var tabbedWindow = (RadTabbedWindow)sender; 
    var childTabControl = tabbedWindow.FindChildByType<RadTabControl>(); 
    childTabControl.OverflowMode = TabOverflowMode.Wrap; 
}