Getting JPanel to update interactively

Hi,
I have a JPanel which I draw onto using a routine in a SwingWorker thread. I want it to update every time I draw onto it (so the user can see it updating the screen). How do I get it to do this rather than just display when it finishes the thread. I've tried repaint(), validate(), repaintImmediately() but they just seem to queue requests for a repaint.
Any suggestions welcomed....#
MArk

I've tried updateImage but with no luck. The Jpanel contains a bufferedImage - I draw to the buffered image and want to be able to update the onscreen display. Any ideas?
MArk

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