Warning! You probably shouldn't be using this property.
When this property is true, no views of this document will be updated as the document is changed, and no undo/redo information is kept. When you set the property to false again, you will need to make sure all the views are correct (you may wish to call InvalidateViews) and that the UndoManager (if any) is in a satisfactory state (you may wish to call GoUndoManager.Clear, so that it cannot be confused by the loss of any undo/redo information while this property was true). You may also need to update the document's bounds (TopLeft and Size) and perhaps call EnsureUniquePartID. No Changed event is raised when this property is set.