GtkRadioMenuItem
   Menu item that is part of a group, only one of which may be selected.
  
Object Hierarchy
Direct subclasses
None.
Description
   
    A GtkRadioMenuItem is one of a group of similar
    widgets, only one of which may be selected at any one time.
   
   
    When the GtkMenuItem version of the 
    "activate" signal has been
    emitted by a GtkRadioMenuItem, there is a second
    emission as the most recently active item is toggled to 
    inactive.  This is dealt with before the original
    signal is handled.
   
   
    One way around this would be to use the 
    "button-press-event" signal. 
    Another would be to set up a count for each individual function and test
    that the count is not divisible by 2.  Or, depending on the kind of
    function you are calling, you could simply allow 
    "activate" to be emitted twice.