DetailDiscolsure button doesn't works on iOS 6

Hi guys, i'm here with a new problem :)

I've followed this recipe http://docs.xamarin.com/recipes/ios/content_controls/map_view/handle_annotation_click to add a DetailDisclosure button on my AnnotationView. Testing my app i've realized that this approach doesn't works on iOS 6 and this problem is also present on your demo.

How can i resolve it?

PS: this solution throws an exception while debugging. If the app is launched from iPhone directly all works fine.