iOS canShowCallout only on Some Annotations

[newtoiphonesdk]

How would you set a mapview to only show callout arrows on some of the annotations? Some of my annotations are for landmarks and do not need to display anything other than a title and subtitle.

 

[jnoxx]

Do they contain an object? For example, a custom made object, or a string you could make an custom init method with?
Then you can compare strings, to decide wether it should show call out or not.

 

[newtoiphonesdk]

Do they contain an object? For example, a custom made object, or a string you could make an custom init method with?
Then you can compare strings, to decide wether it should show call out or not.

Not sure. Here is how I plot the annotations

 DisplayMap *ann28 = [[DisplayMap alloc] init];
    ann28.title = @"Freeman Tower";
    ann28.subtitle = @"";
    ann28.coordinate = tower;
    
    [mapView addAnnotation:ann28];

I add each annotation to a MutableArray called annotations, and then I have this method set up

-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
(id <MKAnnotation>)annotation {
    MKPinAnnotationView *pinView = nil;
    if(annotation != mapView.userLocation)
    {
        static NSString *defaultPinID = @"com.invasivecode.pin";
        pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinView == nil ) pinView = [[[MKPinAnnotationView alloc]
                                          initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];
                   pinView.pinColor = MKPinAnnotationColorRed;
            pinView.canShowCallout = YES;
            pinView.animatesDrop = YES;
            UIButton *detailButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
            [detailButton setTitle:annotation.title forState:UIControlStateNormal];
            NSInteger annotationValue = [self.annotations indexOfObject:annotation];
            
            detailButton.tag = annotationValue;
            
            [detailButton addTarget:self action:@selector(showDetailView:) forControlEvents:UIControlEventTouchUpInside];
            
            pinView.rightCalloutAccessoryView = detailButton;
            return pinView;

        
            }
    else {
        [mapView.userLocation setTitle:@"I am here"];
    }
    return pinView;
}

I tried adding

ann28.accessibilityHint = @"YES";

and then in the annotationView adding

if (annotations.accessibilityHint == @"YES" {
 pinView.pinColor = MKPinAnnotationColorRed;
            pinView.canShowCallout = YES;
            pinView.animatesDrop = YES;}
else {
 pinView.pinColor = MKPinAnnotationColorRed;
            pinView.canShowCallout = NO;
            pinView.animatesDrop = YES;}

But that just made it to where none of the pins would display even a Title. Am I even close to being on the right track?