private void OnDataRequested(DataTransferManager sender, DataRequestedEventArgs args)
 {
     if (RTBookReviewsModel != null)
     {
         RTBookReviewsModel.GetShareContent(args.Request);
     }
 }
 /// <summary>
 /// Load ViewModel items asynchronous
 /// </summary>
 public async Task LoadData(bool isNetworkAvailable)
 {
     var loadTasks = new Task[]
     {
         NewYorkTimesModel.LoadItems(isNetworkAvailable),
         TheGuardianModel.LoadItems(isNetworkAvailable),
         NYRBModel.LoadItems(isNetworkAvailable),
         RTBookReviewsModel.LoadItems(isNetworkAvailable),
         TheIndependentModel.LoadItems(isNetworkAvailable),
     };
     await Task.WhenAll(loadTasks);
 }
 /// <summary>
 /// Refresh ViewModel items asynchronous
 /// </summary>
 public async Task RefreshData(bool isNetworkAvailable)
 {
     var refreshTasks = new Task[]
     {
         NewYorkTimesModel.RefreshItems(isNetworkAvailable),
         TheGuardianModel.RefreshItems(isNetworkAvailable),
         NYRBModel.RefreshItems(isNetworkAvailable),
         RTBookReviewsModel.RefreshItems(isNetworkAvailable),
         TheIndependentModel.RefreshItems(isNetworkAvailable),
     };
     await Task.WhenAll(refreshTasks);
 }