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DragDropManager inside a ChildWindow

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Trying to use the DragDropManager inside a Silverlight Toolkit ChildWindow control (i.e. a popup window) results in strange behaviour. Elements disappear behind the ChildWindow as they are dragged and get 'lost'.
 
Try copy/pasting any of your example pages into a fresh ChildWindow control and you will see what I mean.
 
I think the reason for this is because elements in the ChildWindow aren't attached to the main visual tree, and the DragDropManager has no way of knowing about them.
 
Incidentally, the ListBoxDragDropTarget in the Silverlight Toolkit also suffer from problems when in a ChildWindow.

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