Custom annotationView images revert to pins when clicked - iphone

Question

I'm displaying custom images on a map (instead of the default pins) using the code below. However, when I tap on an item (and the callout appears), the image reverts to the default red pin. How can I keep my custom image, even when the callout is displayed?
- (MKAnnotationView *) mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation
{
MKPinAnnotationView *pinAnnotation = nil;
if (annotation != mapView.userLocation)
{
static NSString *pinID = #"mapPin";
pinAnnotation = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:pinID];
if (pinAnnotation == nil)
pinAnnotation = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:pinID] autorelease];
// Set the image
pinAnnotation.image = [UIImage imageNamed:#"TestIcon.png"];
// Set ability to show callout
pinAnnotation.canShowCallout = YES;
// Set up the disclosure button on the right side
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
pinAnnotation.rightCalloutAccessoryView = infoButton;
[pinID release];
}
return pinAnnotation;
[pinAnnotation release];
}

Answer 1

I found by making the pinAnnotation a MKAnnotationView rather than a MKPinAnnotationView, I got the desired result. Image doesn't turn into a pin anymore
static NSString *pinID = #"mapPin";
pinAnnotation = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:pinID];
if (pinAnnotation == nil)
pinAnnotation = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:pinID] autorelease];
// Set the image
pinAnnotation.image = [UIImage imageNamed:#"TestIcon.png"];

Answer 2

You need to use a subview rather than the image property. This code succssfully solves the problem for me:
UIImage * image = [UIImage imageNamed:#"blue_pin.png"];
UIImageView *imageView = [[[UIImageView alloc] initWithImage:image] autorelease];
[annView addSubview:imageView];