gtk.WindowGroup — a group of gtk.Window
widgets
| class gtk.WindowGroup( | 
A gtk.WindowGroup
object contains a set of gtk.Window widgets
that are managed together by some PyGTK functions and
methods.
    gtk.WindowGroup()| Returns : | a new gtk.WindowGroup. | 
Creates a new gtk.WindowGroup
object. Grabs added with gtk.Widget.grab_add() 
only affect windows within the same gtk.WindowGroup.
    def add_window(window)| 
 | the gtk.Windowto
add | 
The add_window() method adds the gtk.Window specified
by window to the windowgroup.
    def remove_window(window)| 
 | the gtk.Windowto
remove | 
The remove_window() method removes the
gtk.Window
specified by window from the windowgroup.