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Open LoanApp sample schema. Open a new schema In the new schema, in Schema view, right-click namespace, Add > Import In Import, expand By File, select newLoanApplication.xsd enter a prefix click OK In Design view, drag/drop an element, press <CR> -> newElement; Undo is enabled click Undo -> newElement disappears; Undo remains enabled; Redo is enabled click Undo again -> Undo/Redo remain enabled click Undo twice more -> now newElement returns; Undo/Redo remain enabled click Undo -> newElement disappears; Undo finally disabled; Redo enabled click Redo -> newElement returns; Undo/Redo remain enabled ckick Redo -> newElement disappears; Undo/Redo remain enabled Apparently Undo/Redo account for the Add > Import step as well, which explains why Undo stays enabled after newElement is undone. One can keep clicking on Undo while not really observing anything UI-wise in the DV, hence the momentary confusion...