private async void StackPanel_Tapped(object sender, TappedRoutedEventArgs e)
        {

            // Loading mask
            ArticleMask.Visibility = Visibility.Visible;
            ArticleProgressRing.IsActive = true;

            // Gets the selected article
            var frameworkElement = e.OriginalSource as Windows.UI.Xaml.FrameworkElement;
            SelectedArticle = frameworkElement.DataContext as Article;

            await loadArticle();

        }
 private async void LoadArticles()
 {
     Rss.RSS_adress = "https://wpworld.pl/feed/";
     //ArticlesListProgressRing.IsActive = true;
     List<Article> articles;
     try
     {
         articles = await Rss.loadArticles();
     }
     catch (Exception ex)
     {
         MessageDialog md = new MessageDialog("Błąd ładowania artykułów");
         await md.ShowAsync();
         articles = new List<Article>();
     }
     GlobalProgressRing.IsActive = false;
     //ArticlesListProgressRing.IsActive = false;
     Articles = new ObservableCollection<Article>(articles);
     ArticlesListView.ItemsSource = Articles;
     DateTime dateTime = Articles[0].publishDate;
     string date = Articles[0].ParsedDateTime;
     if (!MainVisualStateGroup.CurrentState.Name.Equals("NarrowState"))
     {
         SelectedArticle = Articles[0];
         loadArticle();
     }
 }