Called when a drag-and-drop object is dropped onto the control designer view.
Assembly: System.Design (in System.Design.dll)
This method checks any parent control for a drag-and-drop handler that can handle the operation instead. If one exists, this method passes the DragEventArgs to the method and returns. If no parent drag-and-drop handler exists, this method attempts to create a tool if a toolbox item has been dropped on the designer control.