...
Now the list box displays the icons (randomly set to checked or unchecked) but I'm still seeing the zero value displayed.
I learned how to fix this from Pete Halsted (see http://archive.clarionmag.com/cmag/v1/v1n11checkbox.html). The trick is to use a picture that specifies a space:
...
Now the list box is rounding into shape:
But there's still a potential issue with those icons. I'll either have to ship them with the product or link them into the program. I'd rather do the latter.
...