Defines the UndoStack and associated classes.
UndoStack objects track changes made to regular HTML input elements as well as most Wijmo controls.
It also handles the undo/redo keys automatically and provides commands for performing undo and redo actions programmatically.
The example below creates a form with an undo/redo toolbar. You can edit the data using any controls, and undo/redo your edits at any time.