How to determine scrolling of a textbox

[Patricha]

I am using Access 97;

What I am trying to achieve:
a user must scroll to the bottom of a textbox before a command button will be enabled

This textbox holds Dynamic data and can exceed the normal length of the textbox (which in effect you get a scroll
bar). How can I trap or get this effect to happen.

If the data that gets loaded into the textbox exceed normal length/width to be sure that the user has scrolled down to
the bottom.

Any suggestions

Andrew