For this a drawingarea I use, I want to know about additional events not
normally subscribed to.  In this particular case, I am interested in:

  GDK_LEAVE_NOTIFY_MASK, 
  GDK_BUTTON_PRESS_MASK, 
  GDK_POINTER_MOTION_MASK, 
  GDK_POINTER_MOTION_HINT_MASK.

In glade, I set the events to be the above and the binary (it tells me) is:

  00000010000100001100

When I run the application, these events are not honored.  I have to then
in my application somewhere use the following (to make sure I get the events):

  gtk_widget_set_events (da, gtk_widget_get_events (da)
			 | GDK_LEAVE_NOTIFY_MASK
			 | GDK_BUTTON_PRESS_MASK
			 | GDK_POINTER_MOTION_MASK
			 | GDK_POINTER_MOTION_HINT_MASK);