static void RowHasChildToggled_cb(IntPtr inst, IntPtr path, IntPtr iter)
 {
     try {
         Gtk.TreeModelFilter __obj = GLib.Object.GetObject(inst, false) as Gtk.TreeModelFilter;
         __obj.OnRowHasChildToggled(path == IntPtr.Zero ? null : (Gtk.TreePath)GLib.Opaque.GetOpaque(path, typeof(Gtk.TreePath), false), Gtk.TreeIter.New(iter));
     } catch (Exception e) {
         GLib.ExceptionManager.RaiseUnhandledException(e, false);
     }
 }