CompuServe Messages

I'm trying to implement a list window in AmigaVision, and would like advice on how to proceed. The list may be longer than the window; I would create scroll buttons, of course. My goal is to have the user click on an item in the list, and do processing based on that item. Because of the unpredictable length of the list, and the scrolling aspect, it's not as simple as defining, say, an invisible button residing over each line in the window. The contents of the list will come from a database file. Any ideas? Blaq!