title: How to open call out MKAnnotationView programmatically? (iPhone, MapKit)
body: <p>I want to open up the callout for an <code>MKPinAnnotationView</code> programmatically. Eg I drop 10 pins on the map, and want to open up the one closest to me. How would I go about doing this?</p>
  
  <p>Apple has specified the 'selected' parameter for <code>MKAnnotationView's</code>, but discourages setting it directly (this doesn't work, tried it).</p>
  
  <p>For the rest <code>MKAnnotationView</code> only has a setHighlighted (<strong>same story</strong>), and can <code>ShowCallout</code> method..</p>
  
  <p>Any hints if this is possible at all?</p>