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It's not created automatically. You need to implement this delegate method which will itself be called automatically by the MKMapView:

- (MKAnnotationView *) mapView: (MKMapView *) mapView viewForAnnotation: (id<MKAnnotation>) annotation
{
        MKPinAnnotationView *pin = (MKPinAnnotationView *) [self.mapView dequeueReusableAnnotationViewWithIdentifier: @"asdf"];
        if (pin == nil)
        {
                pin = [[[MKPinAnnotationView alloc] initWithAnnotation: annotation reuseIdentifier: @"asdf"] autorelease];
        }
        else
        {
                pin.annotation = annotation;
        }
        pin.pinColor = MKPinAnnotationColorRed;
        pin.animatesDrop = YES;
        return pin;
}