title: iOS - Cannot get a DetailDisclosure for a button in the callout
body: <p>I am using Swift with iOS 9.   No matter what button type I select, except ContactAdd, only and info icon is rendered.  I am trying to get a DetailDisclosure icon for the right side of the callout in a mapview.  Here is the code:</p>
  
  <pre><code>    let rightButton = UIButton(type: UIButtonType.DetailDisclosure);
      rightButton.addTarget(self, action: "buttonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
      annotationView.rightCalloutAccessoryView = rightButton;
  </code></pre>