[Zope] newbie question about input box for sql method

Hi all, I've followed the Z SQL Method instructions and built a simple interface to a database. I have an input form with four text-input boxes. The values entered into the four input boxes get INSERTed as a database record when the submit button is clicked. I want to change one of those text-input boxes into a selection box -- limiting the user to a dozen or so predefined values (which would be selectable from a menu that appears on the box when you click on it). From the way the Z SQL Method is used in zope, it almost looks like i might have to go into it (SQL.py) and set things up the way I want. Is this right? Is there a better solution? Thanx much in advance, ~c