True if the specified document is in form design mode. Read-only Boolean.
Note This property always returns False if it’s used in code run from Word, but it returns the correct value if it is run through Automation. For example, if you run the example from Excel, it will return True if you’re in design mode.
Remarks
When Word is in form design mode, the Control Toolbox is displayed. You can use this toolbar to insert ActiveX controls such as command buttons, scroll bars, and option buttons. In form design mode, event procedures don't run, and when you click an embedded control, the control's sizing handles appear.