Why isn't my JTree revalidation the scrollpane?

I've got a class that expands JPanel which contains another JPanel, and a JTree inside a JScrollPane.
But the ScrollPane is not activated - when I expand the JTree the nodes are just shown behind the JPanel ...
anyone know why?

What are your observed differences? Since this is a Google app, there's nothing that Apple can do.
 Cheers, Tom

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