Problems Setting FlipView Items source using Data Virtualization - data-binding

Question

This is a follow up from my previous question (UWP Problems Setting GridView Items source using x:Bind).
In that case I was using the random access file data source from Mirosoft's Data virtualization sample and the grid was never being populated. The problem there was that I was not raising the property changed event. The grid now works well.
My problem now is that instead of a grid view I am trying to use the data source in a flip view control. The data source does get initialized, the change property notification is raised but nothing is shown in the flip view.
Can a flip view display data from a virtual collection?
Here is my model's code:
public class PhotoFlipViewViewModel : Mvvm.ViewModelBase
{
private FileDataSource _PicturesCollection;
public FileDataSource PicturesCollection
{
get
{
return _PicturesCollection;
}
set
{
if (_PicturesCollection != value)
{
_PicturesCollection = value;
RaisePropertyChanged(() => PicturesCollection);
}
}
}
public PhotoFlipViewViewModel()
{
initdata();
}
async void initdata()
{
StorageLibrary pictures = await StorageLibrary.GetLibraryAsync(KnownLibraryId.Pictures);
string path = pictures.SaveFolder.Path;
var source = await FileDataSource.GetDataSoure(path);
if (source.Count > 0)
{
PicturesCollection = source;
}
}
public override async Task OnNavigatedToAsync(object parameter, NavigationMode mode, IDictionary<string, object> suspensionState)
{
System.Diagnostics.Debug.WriteLine("PhotoFlipViewViewModel::OnNavigatedToAsync - event fired.");
if ( SessionState.ContainsKey("SelectedPhotoObjectFromGrid"))
{
await Task.CompletedTask;
}
public override async Task OnNavigatedFromAsync(IDictionary<string, object> suspensionState, bool suspending)
{
if (suspending)
{
}
await Task.CompletedTask;
}
public override async Task OnNavigatingFromAsync(NavigatingEventArgs args)
{
args.Cancel = false;
await Task.CompletedTask;
}
}
My FlipView in XAML:
<FlipView x:Name="PhotoOuterFlipView"
BorderBrush="Black"
BorderThickness="1"
VerticalAlignment="Top"
HorizontalAlignment="Stretch"
ItemsSource="{x:Bind ViewModel.PicturesCollection, Mode=OneWay}"
ItemTemplate="{StaticResource PictureFlipViewTemplate}">
<FlipView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</FlipView.ItemsPanel>
</FlipView>
Thanks, any advice is appreciated.