how can i integrate Flurry Full Screen Ads in Windows 8?

This is what I've tried so far: private void Application_Launching(object sender, LaunchingEventArgs e) { FlurryWP8SDK.Api.LogEvent("Start in Launching"); FlurryWP8SDK.Api.StartSession("X34MSN68VGWPW6NMGGZ7"); Frame rootFrame = this.RootFrame as Frame; MainPage page = rootFrame.Content as MainPage; if (page != null) { page.showFullAds(); } this is called from App.xaml.cs and in Mainpage.xaml i created How can i call flurry full screen Ads.