My coworker had a heck of a time with this. There is no way to fully justify the text to be even on both sides for a label, and I'm going to assume for a text box or rich text box either. You can use the Alignment property for left, right, or center justification. There might be a third part control that will do full justification, but we ened up taking a screen shot of a Word document that was fully justified and using an image, but the text we used wasn't going to change.
Good luck.
~Melissa