public FirstView() { this.InitializeComponent(); this.Loaded += (sender, args) => { Current = this; this.TogglePaneButton.Focus(FocusState.Programmatic); }; this.RootSplitView.RegisterPropertyChangedCallback( SplitView.DisplayModeProperty, (s, a) => { // Ensure that we update the reported size of the TogglePaneButton when the SplitView's // DisplayMode changes. this.CheckTogglePaneButtonSizeChanged(); }); SystemNavigationManager.GetForCurrentView().BackRequested += SystemNavigationManager_BackRequested; }