A cursor bug in DragItemAround example

FROM : Ling Wang
DATE : Sun Apr 20 12:43:58 2008

You can see the code at http://developer.apple.com/samplecode/DragItemAround/listing2.html
  on ADC.

The bug is that the cursor reverts to arrowCursor if the item is 
dragged off the bound calculated at the mouseDown event just before 
current mouseDragged event, instead of staying closedHandCursor. Maybe 
it will be clear till you try to run it.

It seems something happens when the mouse moves out of the cursor rect 
that is set for the item's bounds in resetCursorRects. This something 
is out of my knowledge, so I am hoping someone can tell me the cause 
of the bug and a canonical way to fix it, and I'll feedback the 
solution together with the bug on ADC after that.