<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title=""
Height="300"
Width="300">
<Grid>
<FlowDocumentReader>
<FlowDocument>
<Paragraph>
<Bold>This is a line of bold text inside another paragraph.</Bold>
<Bold>This is another line of bold text inside another paragraph.</Bold>
<Bold>This is another line of bold text inside another paragraph.</Bold>
<Bold>This is another line of bold text inside another paragraph.</Bold>
</Paragraph>
</FlowDocument>
</FlowDocumentReader>
</Grid>
</Window>