get_group
Description:
Returns the group to which the radio menu item belongs, as a List of RadioMenuItem.
The list belongs to GTK+ and should not be freed.
Parameters:
| this | 
Returns:
| 
           the group of this  | 
      
Returns the group to which the radio menu item belongs, as a List of RadioMenuItem.
The list belongs to GTK+ and should not be freed.
| this | 
| 
           the group of this  |