This patch enables pygtkgtlext GLSceneButton classes to receive scroll events, which are how GTK2+ seems to deliver mouse wheel events.
Adds a method, button_scroll, to the abstract class.
Adds the SCROLL_MASK event to the list of events and connects the button_scroll method to the event.
Adds samples showing how to recieve this event in the sample classes.
mouse_wheel_scroll_events.patch