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The TreeModel and ComboBoxModel editors in Matisse are great for prototyping forms without having to add code to be able to evaluate their UI. The Form Editor also defines a sample TreeModel for evaluation purposes, but there isn't any way to edit it.
I have implemented a simple TreeModel editor that is useful for prototyping. Modified files: http://hg.netbeans.org/main/rev/c0d8a5bc62fa