I would have thought that not initializing the spinner would cause an exception to be thrown when you try to execute the sp.AddAll call (unless you're adding the spinner to the Activity in the designer)...
How are you adding the spinner to your Activity? In code, or in the designer? If it's in the designer, then you shouldn't initialize it in code.
Put a breakpoint in your ItemClick event (on your MsgBox line) & then you'll know for sure if it's being fired or not. Failing that, just export the whole project & post it on here so we can see it in context.