Annotation Callout Action Not Working

Annotation Callout Action Not Working

This is my code for my action that should take place when the annotation
callout is clicked. It is supposed to take me to a new ViewController but
does not. Is there a small error in this code or is it a bigger problem?
- (void)mapView:(MKMapView *)mapView
annotationView:(MKAnnotationView *)view
calloutAccessoryControlTapped:(UIControl *)control {
NSLog(@"calloutAccessoryControlTapped");
det = [[UIViewController alloc]init];
[self.navigationController pushViewController:det animated:YES];
}