Regions in panes content are not resolved when the pane is unpinned and collapsed. This happens only when you change the regions in runtime while the pane is unpinned and collapsed.

I need a behaior for RadPane like this:

When we have onl one RadPane, then show headr with a full RadPane group width (Which can be achived using PaneHeader)

In opposite - use regular tab style

Also if I undock RadPane to ToolWindow and I have only single item, I want to completely hide tabs/headers

All this should work for Top TabStripPlacement

Panes that are autohidden are cut if resized too much - this is due to limitation in WPF that popups should not cover more than 75% of the screen.

This happens because in the current version of Telerik, the IsTopmost of the ToolWindow that host the floating pane is set to True. That was needed for a related new functionality, but it brings a major behavioral change in the RadDocking control.

To work this around, you can subscribe to the ToolWindowCreated event of RadDocking and set the IsTopmost property of the creating ToolWindow to False.

private void RadDocking_ToolWindowCreated(object sender, Telerik.Windows.Controls.Docking.ElementCreatedEventArgs e)
{
    var window = (ToolWindow)e.CreatedElement;
    window.IsTopmost = false;
}

In OS two monitors are configured: monitor 1 (3840x2160) scale: 200% and monitor 2 (1920x1200) scale 100%.

Our wpf application has a main window, maximized on screen 1 and a child window maximized on screen 2.

In the app.manifest we use per monitor dpi awareness:

<application xmlns="urn:schemas-microsoft-com:asm.v3">
  <windowsSettings>
    <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True/PM</dpiAware>
    <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2,PerMonitor</dpiAwareness>
  </windowsSettings>
</application>

Both windows have a RadDocking instance with a docked RadPane like:

<Grid>
  <telerikDocking:RadDocking Name="Docking"                              
                             HasDocumentHost="True" 
                             telerik:DragDropGroup.Name="VDDragDropGroup">
    <telerikDocking:RadDocking.DocumentHost>
      
            ...
          
    </telerikDocking:RadDocking.DocumentHost>
    <telerik:RadSplitContainer InitialPosition="DockedBottom">
      <telerik:RadPaneGroup>
        <telerik:RadPane Header="Test Panel" IsDockable="True">
          <Border Background="Green">
            <TextBlock Text="Test Panel" HorizontalAlignment="Center" VerticalAlignment="Center"/>
          </Border>
        </telerik:RadPane>
      </telerik:RadPaneGroup>     
    </telerik:RadSplitContainer>
  </telerikDocking:RadDocking>
</Grid>

If you drag and move the docked panel from screen 2 to screen 1 the compass at screen 1 is only shown if the mouse position is in the first quadrant of screen 1 . The compass is shown on the correct place but cannot be activated, so that no dropping is possible.

Without unsing per monitor dpi awareness everything works fine. Unfortunately we must use per monitor dpi awareness for our application.

This bug is also reproducable in V2023.3.1218.

The PaneHeader is shown and then immediately collapsed. 

Setting the PaneHeader to null can be used as a workaround if the project uses the default theme.

When Saving and Loading a layout which has empty DocumentHost an ArgumentOutOfRangeException is thrown