static void GetSize_cb(IntPtr inst, out int width, out int height)
 {
     try {
         IComponentImplementor __obj = GLib.Object.GetObject(inst, false) as IComponentImplementor;
         __obj.GetSize(out width, out height);
     } catch (Exception e) {
         GLib.ExceptionManager.RaiseUnhandledException(e, true);
         // NOTREACHED: above call does not return.
         throw e;
     }
 }