How to use custom renderer to implement Pin clicked event on Map

Since the clicked event on Pin has been added on 1.3.0 but it doesn't works, I'm trying to do this using custom renderer but I have some problem understanding what's behind it.
Should I create a MapRenderer on iOS and I create normal Pin and handle the click event with that? If so, in the class that inherit the MapRenderer, what is that? I thought it was the MKMapView but is not so how should I treat it?