Items not showing in listbox

I've got a simple list box on my VB form and I'm adding strings to it using the standard lstBox.items.add("string") command. However, the items aren't actually showing up in the list box. If I iterate through the items collection using:

For each item in lstBox.items
   msgbox(item)
next

It shows up just fine as part of the collection. It just isnt visible in the list box. If I add items to said collection before compilation, using the IDE, they show up fine and I can delete them in the normal way. I have tried deleting and re-adding it but that hasn't helped.

Quite frankly I am stumped, because I have used listboxes hundreds of times and I can't get this to work. So any help would be appreciated.

Thanks in advance