Dynamic Text Field Resizing

Hi all. I’m VERY new to Flash and I can’t figure this out. I have a dynamic text field that I want to make long enough to fit the text I am going to put in it, but when I try to make it wider by setting the width, it stretches the text in the field. I don’t want it to do that. I want to text to stay the same and just be centered in the box, but I want the box to be pretty big so that I can add longer text messages later. Any idea on how to do this?