JTree has to update a JComboBox (URGENT!)

Hi all,
I have a problem using a JTree and a JComboBox. I would like my JComboBox to be updated when a user clicks on a node of the JTree. I wrote a JPanel containing the JComboBox and implementing the TreeSelectionListener. It turns out that my JPanels listens, ok. In the implementation of the listener, I just wrote code which has to empty my JComboBox... and it does it! When I use the getItemCount() method it returns 0. Great. But now, why isn't my JComboBox updated graphically?? The problem is there: although the JComboBox should be empty, the previous items stay there...Why?
By the way, I use a DefaultComboBoxModel... so that any change to this model should be transmitted to the JComboBox. But it doesn't work (at least graphically).
I hope someone will answer, this is a truly desesperate call! Thanks,
Jack

sounds like you need to revalidate() the panel after your listener on the JTree has done it stuff

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