Problem with  JTree and JPopupMenu

Hi,
I'm using a JPopupMenu with a JPanel in it. In the panel
I want to have a JTree. I can build the tree without
problems but when I try to "go down" in the tree it
vanishes. This happens only the first time that I
access a node. When I initialize the menu a second
time the node I just pressed works fine.
What is the problem????
Here is a sample of my code.
popUpMenu = new JPopupMenu();
thePanel = new JPanel();
thePanel .setLayout(new GridBagLayout());
popUpMenu .add(thePanel );
DefaultMutableTreeNode top = new DefaultMutableTreeNode("The top");
DefaultMutableTreeNode secondNode = null;
DefaultMutableTreeNode firstNode = null;
firstNode = new DefaultMutableTreeNode("One node");
top.add(firstNode);
secondNode= new DefaultMutableTreeNode("One node");
firstNode.add(secondNode);
buildConstraints(gbc, 1, 0, 1, 5, 5, 5, 5, 2, 1); //My contraintsmethod
JTree tree = new JTree(top);
thePanel .add(tree, gbc);

Mate, why are you putting a JPanel in a JPopupMenu? I'd be interested to look at a screenshot of this.
Mitch

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