I believe I'm meeting all the criteria to cause the event to be called, but it's not happening.
I tried uploading the project to your site (29 mb) but your site keeps giving me a 404 error.
So instead I put the app on a google drive, and here's the link...
https://drive.google.com/file/d/0B3MfvEtIvIvxVVZTaFBzcTJpTkU/view?usp=sharing
Thanks
Dave.
Dooohhhhh!!!
Nevermind, I found the problem.
It helps when one defines which class is going to be the GridViewDelegate.