As a user I would like RadPane to have tooltips for show options, pin and close.

When the control contains RadPane instances which Content is provided by a MAF framework that content experiences flickers and disappearing when the RadPane is being floated, docked, pinned or unpinned.

The RestrictedAreaMargin should be used as a starting point for the position when a ToolWindow is being maximized.

When loading a previously saved layout that includes a floated RadPane located on a currently not available monitor, that RadPane should be made visible on the available monitor.

Currently its is directly loaded in its saved location which is not visible.

While the control's DragDropMode is set to Deferred and the RadPane instances contain content which is UI heavy, dragging those RadPane instances in order to reorder or re-dock them may experience performance issues leading to sluggishness of the drag and drop action.

If an custom implementation is implemented that restores the IsActive property state if a RadPane during the control's LoadLayout functionality the "Active" visual state if that RadPane instance is not cleared if different RadPane is selected.

This issue could be observed in the VisualStudioDocking located in the XAML GitHub repository here: https://github.com/telerik/xaml-sdk/tree/master/Docking/VisualStudioDocking

Possible workaround:

A custom RadDocking control can be created, in which the OnCreateAutomationPeer() method is overridden. OnCreateAutomationPeer() should return a custom RadDocking AutomationPeer, in which the ToolWindowAutomationPeer is removed from the collection of child elements of RadDocking AutomationPeer.
Approach demonstrated in the attached project.

    After starting the application, there are 2+ RadPane instances
    Each RadPane contains multiple TextBox controls
    Click on a TextBox in first RadPane
    Switch to the next RadPane
    go back to the first RadPane

The desired behavior is that the focus is restored to the focused element in step 3. Currently no element is focused. The same scenario in RadTabControl is a bit different and the TabControl focused the first element in its TabItem content.

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

If you drag the pane from one RadDocking element to another, the ActivePane of the docking that started the drag operation is not cleared. The ActivePane should be updated (set to null, or updated in accordance to the PaneActivationMode setting) because the corresponding pane is no longer in this RadDocking instance.

To work this around, you can subscribe to and manually update the ActivePane property.

   private void RadDocking_LayoutChangeEnded(object? sender, EventArgs e)
    {
        var docking = (RadDocking)sender;
        if (docking.ActivePane != null && !docking.Panes.OfType<RadPane>().Contains(docking.ActivePane))
        {
            docking.ActivePane = null;
        }
    }