protected override void OnCreate(Bundle savedInstanceState)  
        {  
            TabLayoutResource = Resource.Layout.Tabbar;  
            ToolbarResource = Resource.Layout.Toolbar;  
  
            base.OnCreate(savedInstanceState);  
  
            Forms.SetFlags("CollectionView_Experimental");  
            Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);  
            LoadApplication(new App());  
        }