/// <summary>
        /// Invoked when the application is launched normally by the end user.  Other entry points
        /// will be used such as when the application is launched to open a specific file.
        /// </summary>
        /// <param name="e">Details about the launch request and process.</param>
        protected override void OnLaunched(LaunchActivatedEventArgs e)
        {

#if DEBUG
            if (System.Diagnostics.Debugger.IsAttached)
            {
                //this.DebugSettings.EnableFrameRateCounter = true;
            }
#endif

            AppShell shell = Window.Current.Content as AppShell;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (shell == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                shell = new AppShell();

                shell.Language = Windows.Globalization.ApplicationLanguages.Languages[0];

                shell.AppFrame.NavigationFailed += OnNavigationFailed;

                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    //TODO: Load state from previously suspended application
                }

            }

            // Place our app shell in the current Window
            Window.Current.Content = shell;

            if (shell.AppFrame.Content == null)
            {
                // When the navigation stack isn't restored navigate to the first page,
                // configuring the new page by passing required information as a navigation
                // parameter
                shell.AppFrame.Navigate(typeof(MapPage), e.Arguments, new Windows.UI.Xaml.Media.Animation.SuppressNavigationTransitionInfo());
            }
            // Ensure the current window is active
            Window.Current.Activate();
        }
        /// <summary>
        /// Initializes a new instance of the AppShell, sets the static 'Current' reference,
        /// adds callbacks for Back requests and changes in the SplitView's DisplayMode, and
        /// provide the nav menu list with the data to display.
        /// </summary>
        public AppShell()
        {
            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;

            NavMenuList.ItemsSource = navlist;
        }