public void Handle(PlayItemAtIndexMessage message)
 {
     throw new System.NotImplementedException();
 }
 public void Handle(PlayItemAtIndexMessage message)
 {
     var index = message.Index;
     if (index >= 0 && index < Items.Count)
     {
         StartPlaybackAction(index);
     }
 }
 public void Handle(PlayItemAtIndexMessage message)
 {
 }