title: How do I execute code when a user switches back to my UWP app?
body: <p>In Windows Phone and Windows 8.1, OnNavigatedTo would be invoked when a page became the visible page after navigation from any page. Now, it seems that this method is only called when switching between pages in the current app. How do I execute code when a user switches back to my app from another one (ie using the back button). I've tried the Application.Resuming event, but this is not fired either.  </p>