The AnnotationUndoManager type exposes the following members.
Gets or sets the number of undo/redo levels to keep in memory.
Gets a value indicating whether the manager is merging undos added into a single undo action.
Gets the number of redos available.
Gets the description string of the redo that will be performed when Redo is called.
Gets the number of undos available.
Gets the description string of the undo that will be performed when Undo is called.