public override bool OnCreateOptionsMenu(IMenu menu) { MenuInflater.Inflate(Resource.Menu.spinner, menu); var spinnerItem = menu.FindItem(Resource.Id.num_of_folds); var spinner = (Spinner)MenuItemCompat.GetActionView(spinnerItem); spinner.ItemSelected += (s, e) => { var numberOfFolds = int.Parse(e.Parent.GetItemAtPosition(e.Position).ToString()); var fold = _drawer.GetFoldingLayout(_drawerList); if (fold != null) { fold.NumberOfFolds = numberOfFolds; } }; return(base.OnCreateOptionsMenu(menu)); }