<RichTextBox >
<FlowDocument>
<Paragraph>
This is a richTextBox. I can
<Bold>Bold</Bold> ,
<Italic>Italicize</Italic> ,
<Hyperlink>Hyperlink stuff</Hyperlink> right in my document.
</Paragraph>
</FlowDocument>
</RichTextBox>
RichTextBox r = new RichTextBox();
Paragraph p = new Paragraph();
r.Document.Blocks.Add(p);
不能直接.Blocks