>Hi again,
>
>Currently I have a maximum of 34 items in the listbox, but it could grow over time to up to 1 million records in the future. Based upon your experience and that huge second number of mine it sounds like I might want to think about using a grid instead of a listbox.

Not only is a listbox unstable at anything over a couple hundred entried, but its a bad UI choice. The user can't possible scroll through a million records productively. Better to give them a text box by which to narrow their search.