iphone - カスタム吹き出しビューでマップの中心が表示されない

Question

+ (MultiRowCalloutAnnotationView *)calloutWithAnnotation:(id<MultiRowAnnotationProtocol>)annotation onCalloutAccessoryTapped:(MultiRowAccessoryTappedBlock)block {
    return [[[MultiRowCalloutAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:MultiRowCalloutReuseIdentifier onCalloutAccessoryTapped:block] autorelease];
}

- (id)initWithAnnotation:(id<MultiRowAnnotationProtocol>)annotation reuseIdentifier:(NSString *)reuseIdentifier onCalloutAccessoryTapped:(MultiRowAccessoryTappedBlock)block {
    self = [super initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:reuseIdentifier];
    if (self) {
        self.contentHeight = 80.0;
        _yShadowOffset = 6;
        self.offsetFromParent = CGPointMake(8, -14); //this works for MKPinAnnotationView
        self.enabled = NO;
        self.backgroundColor = [UIColor clearColor];
        self.cellInsetX = 15;
        self.cellOffsetY = 10;
        self.onCalloutAccessoryTapped = block;
        [self setTitleWithAnnotation:annotation];
        [self setCalloutCellsWithAnnotation:annotation];
    }
    return self;
}

- (id)initWithAnnotation:(id<MultiRowAnnotationProtocol>)annotation reuseIdentifier:(NSString *)reuseIdentifier {
    self = [self initWithAnnotation:annotation reuseIdentifier:reuseIdentifier onCalloutAccessoryTapped:nil];
    return self;
}

画像参照はこちら