VS 2008 Equalize Size of Lines in RichtextBox

I want to make a poetry writing application. I want every verse of a poem to be equal in size. e.g

Some love good some love bad
We all want something we never had

This should look like this by adding white spaces or something else.

I can justify the text in Richtextbox but how to check the size biggest line in Richtextbox selection and then equalize all lines according to that line.

Any help please.