How to make my rdlc report multiline textbox - text as full length?

Iam using VS2010 - C#. With my project I have a Multiline TextBox in RDLC reports. I wish to make my text as full length to my report multiline TextBox. text box So that it will look better and all lines of text will look like same length. Is it possible?

For example my textbox is having 1.5 lines of text, Is it possible to make it as 2 lines of text.

thanks & Regards Paramu