static void RemoveFocusHandler_cb(IntPtr inst, uint handler_id)
 {
     try {
         IComponentImplementor __obj = GLib.Object.GetObject(inst, false) as IComponentImplementor;
         __obj.RemoveFocusHandler(handler_id);
     } catch (Exception e) {
         GLib.ExceptionManager.RaiseUnhandledException(e, false);
     }
 }