title: Disable touches on MKAnnotationView
body: <p>When clicking MKAnnotationViews on a map they are temporarily brought to the front. I don't want this behaviour has I have a lot of MKAnnotationViews that are just icons on the map that don't have any other function.</p>
  
  <p>I've tried setting the MKAnnotationView's <code>userInteractionEnabled</code> to <code>NO</code> but it does not work. The MKAnnotationView still comes to the front when touched. This is confusing as MKAnnotationView is just a UIView so I can't work out why <code>userInteractionEnabled</code> is being ignored.</p>