c# Richtext box how to set text margin in winform

I am using Richtext box in winform to load an rtf file.

the text align in rtf file is justify, however after loaded in richtext box it just left aligned. I wonder is there any method 开发者_JAVA百科to set the justify align in richtext box.

And i can't find a property to set text margin inside the richtextbox.is there anyone know how to solve this problem?

---

See this http://geekswithblogs.net/pvidler/archive/2003/10/14/182.aspx