Allows the designer to respond when a notification is sent to the form.
procedure Intf_Notification(AnObject: TPersistent; Operation: TOperation);
When a form receives a notification, it calls the Notification method of the designer, allowing the designer to respond to all the notifications the form receives.
It is implementation of IDesignerNotify.Notification.
procedure IDesignerNotify.Notification = Intf_Notification;