iOS6 Maps, MISSING the Detail Disclosure Button (the blue chevron) on all my maps! How to get it back

Question

My understanding was there was no problems moving to iOS 6 maps. But for some reason, the Detail Disclosure Button is now MISSING in my map App. Is there a way to get this back. Wow, totally unexpected. This has been working for years, so all delegates are fine.

#pragma mark MKMapViewDelegate
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {

MKPinAnnotationView *pin = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"REUSEME"] autorelease];
UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

if ([annotation isKindOfClass:[MKUserLocation class]]) {
    pin.animatesDrop = YES;
    return nil;
} else {
    [pin setPinColor:MKPinAnnotationColorGreen];
}

pin.rightCalloutAccessoryView = button;
pin.animatesDrop = YES;
pin.canShowCallout = YES;

return pin;
}

Answer 1

Now in iOS 6 you have to set the delegate before adding the annotation to the mapView

seen in here: http://www.openradar.me/12346693

Answer 2

I had the same problem and setting the MapView delegate in the Storyboard did the trick for me, callout arrows now working:)

Answer 3

I had the same problem, I only put the delegate after annotation and work perfectly!

mapView.delegate = self;
[self.mapView addAnnotation:ann];

Tks, Cauca