Fwd: Perplexing Behavior of combobox

[Matthew <matthew mattshouse com>]

I'm experiencing some difficulty getting a combobox to populate correctly. 
I've described the problem, including screenshots, at the web address:
http://www.mattshouse.com/gtkproblem.html

Since there are 2 images used in the description, I thought it best not to post
them to the list.  

Thanks,

Matthew