Dynamically updating dragImage?

• Gerd Knops Dynamically updating dragImage? Nov 09 2007, 03:27
  I have a situation where it would be helpful to provide some visual
  status while dragging an item around, ideally by modifying the dragged
  image itself.
  
  I tried to update the image during drag (eg lockFocus/draw/
  unlockFocus), but that has no effect (not that I expected that to work).
  
  Has anyone succeeded in modifying the dragImage while dragging?
  
  Thanks
  
  Gerd