public MainPage()
 {
     this.InitializeComponent();
     //MediaElement sound = new MediaElement();
     //sound.AudioCategory = Windows.UI.Xaml.Media.AudioCategory.BackgroundCapableMedia;
     //StorageFolder folder = await Package.Current.InstalledLocation.GetFolderAsync("Assets");
     Story_Arrow.Begin();
     Story_Arrow.Completed += Story_Arrow_Completed;
     Storyboard1.Completed += Storyboard1_Completed;
     Storyboard2.Completed += Storyboard1_Completed;
     Storyboard3.Completed += Storyboard1_Completed;
     Story_ck3.Completed   += Storyboard1_Completed;
     Story_ck4.Completed   += Storyboard1_Completed;
     Story_ck5.Completed   += Storyboard1_Completed;
     Story_ck6.Completed   += Storyboard1_Completed;
 }
 void Story_Arrow_Completed(object sender, object e)
 {
     Story_Arrow.Begin();
 }
 public PG_Level2()
 {
     this.InitializeComponent();
     Story_Arrow.Completed += Story_Arrow_Completed;
     Story_Arrow.Begin();
 }