Scrollbar with dynamic text

Im having serious issues with this scrollbar. Im using FlashMX2004 (version 7.2) and for the past few days I have been trying to get this scrollbar to work correctly. I have a dynamic text box that is loading a .txt file. I drag over the UIScrollBar icon and it snaps to the dynamic box…I give it the same instance name as the dynamic text box…all Im getting is a white scroll bar with no arrows or ability to scroll. The only way to scroll is by using your wheel on your mouse.

Any clue to what Im doing wrong?