protected override void OnElementChanged(ElementChangedEventArgs <Xamarin.Forms.ListView> e)
 {
     base.OnElementChanged(e);
     if (Control != null)
     {
         CustomListView view = (CustomListView)e.NewElement;
         Control.ItemLongClick += (s, args) =>
         {
             Control.SetItemChecked(args.Position, true);
             Java.Lang.Object item = Control.GetItemAtPosition(args.Position);
             view.OnLongTapped(item.GetType().GetProperty("Instance").GetValue(item));
         };
     }
 }