how to cancel window activation?

Hi Gregory,

We don't currently support cancelling a selection change. Things can get tricky in that area, since the selection can change for a number of reasons (user selects a tab, moves focus, opens/docks/autohides/floats/closes a window).

The rafting windows are separate Window instances, and therefore their events will not bubble up through the DockSite and the main Window. You would need to add a class handler for the RaftingWindow and the SelectedChangedEvent to be able to handle those. But the cleanest solution would be use to an attached behavior. Effectively, you create a custom class (i.e. MyCustomBehavior) with a single attached dependency property of type bool (i.e. IsManaged). You would add a property value changed handler for IsManaged, where you would attach to the SelectedChanged event of the ToolWindowContainer/TabbedMdiContainer when the value is changed to true and detach the handler when it's false.

Then you'd set MyCustomBehavior.IsManaged to true for all instances of ToolWindowContainer/TabbedMdiContainer using an implicit Style defined in your application resources. Because the Style is in your application resources, it will be picked up by both the main window and any rafting windows.