Problem Adding Tree Node the second time around.

I got a tree and a fixed parent nodes of my dynamic childs.
It works fine during the first call but not on the successive calls.
This code is called via popup many times as the user wish ...
// nodelabels is the default parent.
DefaultMutableTreeNode x = new DefaultMutableTreeNode("My New Node");
nodelabels.add(x);
Please help I am stuck with this thing.
Thanks and Advance.

you should post the model you use for the tree (if you use one)...

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