<FlowDocumentPageViewer xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <FlowDocument ColumnWidth="800"> <Paragraph><Rectangle Fill="Black" Height="1" Width="500" HorizontalAlignment="Left" /><LineBreak/></Paragraph> <Paragraph><Bold>XAMLPad</Bold> </Paragraph > </FlowDocument> </FlowDocumentPageViewer>