 -- Class: <gtk-window-group>
     Derives from <gobject>.

     This class defines no direct slots.

 -- Function: gtk-window-group-new =>  (ret <gtk-window-group>)
     Creates a new <gtk-window-group> object. Grabs added with gtk-grab-add only affect windows within the same <gtk-window-group>.

     ret
          a new <gtk-window-group>.

 -- Function: gtk-window-group-add-window (self <gtk-window-group>) (window <gtk-window>)
 -- Method: add-window
     Adds a window to a <gtk-window-group>.

     window-group
          a <gtk-window-group>

     window
          the <gtk-window> to add

 -- Function: gtk-window-group-remove-window (self <gtk-window-group>) (window <gtk-window>)
 -- Method: remove-window
     Removes a window from a <gtk-window-group>.

     window-group
          a <gtk-window-group>

     window
          the <gtk-window> to remove