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Go to mobile Project Properties> Category> Sources&Filtering> Focus in the tree press space bar, the Quick Serach doesn'twork.
The quick search works in every other TreeView, so I suspect that the tree used in the customizer is a plain JTree and not a TreeView. Please reassign to j2me - I tried to do so, but issuezilla protested for some reason :-(
(OK, the reassign worked on subsequent attempt...)
There is regular TreeView and quick search works when at least one node is expanded. Closing as it works for me.