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After creating a new node in a transition path it is not possible to undo that action. Ctrl+Z just beeps and the undo action in the menu is greyed out. I've noticed this on the state diagram editor, but I assume it applies to all the other UML diagram editors as well (and possible other graphical editors in Netbeans).
Ah, I see this is a duplicate. Marked as such. Apologies. *** This issue has been marked as a duplicate of 79680 ***