public override async Task InitializeAsync(object navigationData) { if (navigationData is Tutorial) { IsBusy = true; var tutorial = (Tutorial)navigationData; Tutorial = tutorial; var videos = await _tutorialService.GetVideosAsync(tutorial.Id); if (videos.Videos.Any()) { var video = videos.Videos.First(); Video = string.Format("{0}{1}", AppSettings.YouTubeUrl, video.Key); } _video = "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"; IsBusy = false; } }