public void OnUpdateHomePivotIndex(PageIndexEnum index) => UpdateHomePivotIndex?.Invoke(this,
                                                                                         new PageIndexChangedEventArgs {
     NewIndex = index
 });
 public PivotItemViewModel(PageIndexEnum currentPivot)
 {
     CurrentPivot = currentPivot;
     ThumbnailsSource.CollectionChanged += ThumbnailsSource_CollectionChanged;
 }