void OnScrollComment(object sender, EventArgs args)
 {
     if (ViewModel.ArticlesComments.Count > 0)
     {
         ArticlesDetailsView.ScrollTo(ViewModel.ArticlesComments.First(), ScrollToPosition.Start, false);
     }
 }
 private void OnResult(ArticlesComments result)
 {
     if (result != null)
     {
         ViewModel.AddComment(result);
         ArticlesDetailsView.ScrollTo(ViewModel.ArticlesComments.Last(), ScrollToPosition.Start, false);
     }
 }