Just a bit of info for all ...
Somewhere on the site is an example on how to emulate the XP themed look in the xpTaskBox.
If you use the ProvideItemsBackgroundBrush you will need to test that the box is not collapsed before using it as the rectangle size is 0 when collapsed and raises an exception error.
Also as an aside, it seems to call the event on all mousemovements over the control as well
BOb