Windows 10 UAP bouton de retour

Ajoutez le code suivant à votre Application.xaml.cs et il prendra en charge la navigation sur desktop, tablette et mobile (je l'ai testé sur l'émulateur mobile)
pour mieux mis en lumière des différences et de l'explication (La manipulation du Bouton de Retour Dans Windows 10 UWP Apps par JEFF PROSISE)

sealed partial class App : Application
{
public App()
{
this.InitializeComponent();
this.Suspending += OnSuspending;
}
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
//Do not repeat app initialization when the Window already has content,
//just ensure that the window is active
if (rootFrame == null)
{
//Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
rootFrame.Navigated += OnNavigated;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
//Place the frame in the current Window
Window.Current.Content = rootFrame;
//Register a handler for BackRequested events and set the
//visibility of the Back button
SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
rootFrame.CanGoBack  ?
AppViewBackButtonVisibility.Visible :
AppViewBackButtonVisibility.Collapsed;
}
if (rootFrame.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
rootFrame.Navigate(typeof(MainPage), e.Arguments);
}
//Ensure the current window is active
Window.Current.Activate();
}
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
private void OnNavigated(object sender, NavigationEventArgs e)
{
//Each time a navigation event occurs, update the Back button's visibility
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
((Frame)sender).CanGoBack ?
AppViewBackButtonVisibility.Visible :
AppViewBackButtonVisibility.Collapsed;
}
private void OnSuspending(object sender, SuspendingEventArgs e)
{
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: Save application state and stop any background activity
deferral.Complete();
}
private void OnBackRequested(object sender, BackRequestedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
if (rootFrame.CanGoBack)
{
e.Handled = true;
rootFrame.GoBack();
}
}
}