Update sample and version number

samples/NotificationFlyoutSample/SampleFlyout.xaml.cs

@@ -0,0 +1,18 @@
+using Windows.UI.Xaml;
+
+namespace NotificationFlyoutSample
+{
+    public sealed partial class SampleFlyout
+    {
+        public SampleFlyout()
+        {
+            InitializeComponent();
+        }
+
+        private void OnCloseMenuFlyoutItemClick(object sender, RoutedEventArgs args)
+        {
+            var app = GetApplication();
+            app.Exit();
+        }
+    }
+}