Scrolling Dynamically loaded text - Flash MX

Hi all,
I have a text box which dynamically loads the information from a .txt file. I want to scroll the text, with buttons that I have made(not the component scroll bar that comes with Flash MX), up and down through the text I have. I’ve tried many different scripts, and none seem to work. Is there a good concise walkthrough for this anywhere? or can someone steer me in the right direction? any help would be much appreciated,

Thank you very much,
gb