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1. Create new schema. 2. Add an element in Schema View. 3. Switch to Design View. 4. Rename an element (double-click it, enter new name, press Enter). Result: Undo in Edit menu is disabled. 5. Add new element (drag&drop). Result: Undo is still disabled.
sonali, could this be 'coz of some recent changes in refactoring?
This is a known issue. Please see 48427 http://www.netbeans.org/issues/show_bug.cgi?id=48427 In the Design view, right-click on the element to invoke the context-sensitive menu, and use the Refactor -> Undo to undo the refactoring.
*** This issue has been marked as a duplicate of 99870 ***
Verified duplicate