Clears the list of actions that can be undone for the specified publication. Corresponds to the list of items that appears when you click the arrow beside the Undo button on the Standard toolbar.
expression.UndoClear
expression Required. An expression that returns one of the objects in the Applies To list.
Include this method at the end of a macro to keep Visual Basic actions from appearing in the Undo box (for example, "VBA-Selection.InsertAfter").
This example clears the list of actions that can be undone for the active publication.
ActiveDocument.UndoClear