title: Changing pin color MKMapView
body: <p>I add annotations to my map in this way:</p>
  
  <pre><code>MyAnnotation *annotationPoint2 = [[MyAnnotation alloc] init];
  annotationPoint2.coordinate = anyLocation;
  annotationPoint2.title = [NSString stringWithFormat:@"%@", obj];
  annotationPoint2.subtitle = @"";  //or set to nil
  annotationPoint2.keyValue = [NSString stringWithFormat:@"%@", key];
  [mapPins addAnnotation:annotationPoint2];
  </code></pre>
  
  <p>The pins are all red, and I would like them all green. How can I change the color? I have tried the following, but it still gives a red mark:</p>
  
  <pre><code>annotationPoint2.pinColor = MKPinAnnotationColorGreen;
  </code></pre>