The LayoutUpdated method comes from the framework and is fired whenever Silverlight detects that the layout was changed which is much more frequently than the Docking control's layout is updated. We don't recommend you to use this event.
The LayoutChangeStarted and LayoutChangeEnded events are fired when the layout of the Docking control is changing which doesn't actually happen when you are dragging already floating pane. The ToolWindow control also has these events so you could use them to handle all the situations.
You could also use the PaneStateChanged event of the Docking control in combination with the some of the events of the ToolWindow - LocationChanged, SizeChanged, LayoutChangeStarted, LayoutChangeEnded.
Hope this information is helpful.
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