Hi,

Are you running the preview code immediately after loading? It might be that the WPF arrange phase hasn't completed when the paginator get the VisualBrush used for printing. You could try running the UpdateLayout method before printing.

Stoyan

Hi Matt,

With some trial and error we found the following method to make it work correctly:

private void OnFilePrintPreview(object sender, RoutedEventArgs e)
{
     XmlDocument xmlDoc = new XmlDocument();
     diagram.SaveToXml(xmlDoc);

     Diagram copyDiagram = new Diagram();
     copyDiagram.LoadFromXml(xmlDoc);
     sv.Content = copyDiagram;
     copyDiagram.UpdateLayout();
     DiagramPaginator dp = (DiagramPaginator)copyDiagram.DocumentPaginator;
     sv.Content = diagram;
     // etc ...
}

where 'sv' is the original ScrollViewer container of diagram. Our guess is that UpdateLayout works correctly only for controls that are part of the visual tree, so you must add copyDiagram at least temporarily as a child in the UI tree.

I hope that helps,
Stoyan