WebListBox's Context Menu inside a container control won't respond

I’m new here so this may have a simple solution that I’m not aware of. I placed a WebListBox inside a container control and embedded that into a WebPage. The ListBox works fine. It has a Context Menu that displays as expected when right-clicked, but won’t respond when selected.

I want to use it for navigation but I can’t even get it to fire off a MessageBox. It’s like it just doesn’t recognize that it’s been selected. What am I doing wrong?

I am using the standard “Select Case hitItem.Value…” code. Any help would be appreciated!