MKMapView: Bring some annotation views above others?

I have an MKAnnotationView subclass called ImageAnnotationView. It basically displays an image on the map. I want the regular MKAnnotationView views (the default pins) to appear above the ImageAnnotationView views.

This is what I've tried so far but it doesn't seem to work:

- (void)mapView:(MKMapView *)imapView didAddAnnotationViews:(NSArray *)views {
    for (MKAnnotationView *annView in views) {
        if ( [annView isKindOfClass:[ImageAnnotationView class]]开发者_运维知识库 ) {
            [imapView sendSubviewToBack:annView];
        }
    }
}

Am I doing this in the wrong place? Are the MKAnnotationViews all direct subviews of MKMapView or is there some hidden hierarchy?

Any ideas or help are welcome.

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it should work, im doing same just in MKAnnotationView subclass [[self superview] sendSubviewToBack:self];