GtkMenu::get_active
    
     get_active()  can be used to
     retrieve the currently selected GtkMenuItem 
     object through the menu.  Note that this method returns the menu item
     object itself, and is really only useful for comparison against a set
     of criteria.  In most instances it would be more efficient to connect
     the individual menu item's 
     "activate" signal.
    
    
     The get_active()  method is used
     internally in GtkOptionMenu's 
     set_history()  to compare
     the menu item currently selected by the user against that previously
     displayed.