Update version

samples/NotificationFlyoutSample/NowPlayingFlyout.xaml.cs

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+using Windows.UI.Xaml;
+
+namespace NotificationFlyoutSample
+{
+    public sealed partial class NowPlayingFlyout
+    {
+        public NowPlayingFlyout()
+        {
+            InitializeComponent();
+            Opened += OnOpened;
+        }
+
+        private void OnOpened(object sender, object args)
+        {
+            RootFrame.Navigate(typeof(NowPlayingPage));
+        }
+
+        private void OnCloseMenuFlyoutItemClick(object sender, RoutedEventArgs args)
+        {
+            var app = GetApplication();
+            app.Exit();
+        }
+    }
+}