My viewForAnnotation function is never called? - iphone

Question

I have made these pieces of code for my custom annotation:
- (void)viewDidLoad
{
[super viewDidLoad];
mapView.delegate=self;
[self AddLocations];
[self initiateMap];
......
this is my addLocation function:
-(id<MKAnnotation>)addAnnotationWithTitle: (NSString*) title coordinate:(CLLocationCoordinate2D)
Location imageName:(NSString*) imageName{
CustomAnnotation *annotation = [[CustomAnnotation alloc]init];
annotation.title = title;
annotation.subtitle = #"This is a subtitle";
[annotation setCoordinate:Location];
annotation.imageName = imageName;
return annotation;
}
and my CustomAnnotation Class:
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
NSLog(#"Test");
if([annotation isKindOfClass:[MKUserLocation class]]){
return nil;
}
if([annotation isKindOfClass:[CustomAnnotation class]]){
CustomAnnotation *customAnnotation = annotation;
static NSString* annotationid = #"Annotation";
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:annotationid];
if(!annotationView){
annotationView = [[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:annotationid];
annotationView.canShowCallout = YES;
annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
}else{
annotationView.annotation = annotation;
}
annotationView.image = [UIImage imageNamed:customAnnotation.imageName];
return annotationView;
}
return nil;
}
For some reason the viewForAnnotation function is never used. Can anyone help me out here?
Thanks