Maybe I try to implement such a feature. But I will need to know more about the state and statesaving of the tree.
At the moment the model seems not to get saved by UITreeData.  And what is the method getNode() in UITreeData and TreeModel for?
I wonder why the state of the node is not saved with the node itself. That would make it very easy to expand or collapse a node, as the whole tree of
TreeNodes is saved with the component state anyway.
As I browsed through the code I found a "private boolean expanded" in TreeNodeBase. Did you planned such a feature there?

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