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...so when a DDO is open in the editor, most menu items are disabled.
Probably something to do with multiview registration.
Well, the problem is not missing DataObject (it is there), but missing Node.
ergonomics#82ccfbce0b21
Integrated into 'main-golden' Changeset: http://hg.netbeans.org/main-golden/rev/82ccfbce0b21 User: Jaroslav Tulach <jtulach@netbeans.org> Log: #200979: Make sure Node is in lookup of DefaultDataObject's multiview editor