ActionBarCompat.DrawerLayout.DrawerLayoutActivity.OnPrepareOptionsMenu C# (CSharp) Метод

        public override bool OnPrepareOptionsMenu(IMenu menu)
        {

            var drawerOpen = this.drawer.IsDrawerOpen(this.drawerList);
            //when open don't show anything
            for (int i = 0; i < menu.Size(); i++)
                menu.GetItem(i).SetVisible(!drawerOpen);


            return base.OnPrepareOptionsMenu(menu);
        }