Set HorizontalAnchor, VerticalAnchor, Background for Figure
<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>
<Figure HorizontalAnchor="PageCenter" VerticalAnchor="PageCenter" Background="WhiteSmoke">
<Paragraph>This is a simple paragraph inside a Figure.
This is a simple paragraph inside a Figure.
This is a simple paragraph inside a Figure.
This is a simple paragraph inside a Figure.
This is a simple paragraph inside a Figure.
</Paragraph>
</Figure>
</Paragraph>
</FlowDocument>
</FlowDocumentReader>
</Grid>
</Window>
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