How to reset a the contents of a JPanel

I was just wondering the different ways one could go about resetting a JPanel. That is to clear everything then reload it.
AKA a game of chess where the pieces have already been moved...then on the click of a button the pieces go back to their original starting positions.
I've checked the API and fiddled about with hide(), show(), dispose() and re-adding the contents but to no avail. Well one method sort've worked but my algorithms became un-workable.
Just wondering what the best (most efficient perhaps?) way of going about this would be.
Thank you in advance.

There's an example of replacing a JPanel here...
http://forum.java.sun.com/thread.jspa?forumID=54&threadID=5248903&start=14
It's in there somewhere, trust me... somewhere in the bit that changes the screen size.

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How to reset a the contents of a JPanel

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