Here’s a class that creates a Scrollbar and TextField, that requires no AS at all. The example inlcudes all of the Classes in a package. The classes include, SimpleScrollBar, SimpleScrollText and ScrollBarEvent.
These classes look for MovieClips with the names up_mc, down_mc, drag_mc, track_mc and scroll_txt. You can leave up_mc and down_mc if you do not want these buttons. Or use only the buttons and leave out drag_mc and track_mc.
Assign the SimpleScrollText or SimpleScrollBar class to the Base Class of the MovieClip that contains the Scrollbar elements.