Application.BeforeWindowSelDelete Event (Visio)
Occurs before the shapes in the selection of a window are deleted.
The BeforeWindowSelDelete event fires if user interactions cause shapes in a window to be deleted. It doesn't fire if a program deletes shapes in a window by using the Cut method, for example.
If you're using Microsoft Visual Basic or Visual Basic for Applications (VBA), the syntax in this topic describes a common, efficient way to handle events.
If you want to create your own Event objects, use the Add or AddAdvise method. To create an Event object that runs an add-on, use the Add method as it applies to the EventList collection. To create an Event object that receives notification, use the AddAdvise method. To find an event code for the event you want to create, see Event codes.