public MediaGroup() : base() { this.ExtensionFactories.Add(new Duration()); this.ExtensionFactories.Add(new Private()); this.ExtensionFactories.Add(new VideoId()); // replace the media group default media credit with a new one. MediaCredit c = new Google.GData.YouTube.MediaCredit(); this.ReplaceFactory(c.XmlName, c.XmlNameSpace, c); // replace the media group default media content with a new one. MediaContent m = new Google.GData.YouTube.MediaContent(); this.ReplaceFactory(m.XmlName, m.XmlNameSpace, m); }