public MainPage() { this.InitializeComponent(); this.NavigationCacheMode = NavigationCacheMode.Enabled; // set data context _mainVm = SingletonLocator.Get<MainViewModel>(); DataContext = _mainVm; // set initial items panel template (from settings) var iptIndex = new AppSettings().ItemsControlViewInfoIndex; SetItemsPanelTemplate(iptIndex); Loaded += MainPage_OnLoaded; // listen for back-button HardwareButtons.BackPressed += async (sender, args) => { if (_mainVm.IsSortingControlVisible) { _mainVm.ToggleSorterControlVisibility(); await _mainVm.ApplySortAsync(); args.Handled = true; } }; }