David,

I will probably keep messing with this because I hate letting something get the best of me. As far as your code goes, I have no doubt that it works. In the form that I'm having the trouble with, I found that in testing that if I took out all the code repopulates the array that is the rowsource for the listbox, then it too will detect the doubleclick.
However, the treeview .ZIP you pointed me to, does the trick. I have already done a few tweaks. It works great and recognizes the difference between single and double clicks.
Thanks for all your help.

Joey...