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Product Version: NetBeans IDE Dev (Build 200812050201) Java: 1.6.0_11; Java HotSpot(TM) Client VM 11.0-b16 System: Windows XP version 5.1 running on x86; Cp1251; ru_RU (nb) Looks like there is no way to undo or redo anything in UML editor.
*** This issue has been marked as a duplicate of 79680 ***