title: Create a iOS6 Maps MKUserTrackingBarButtonItem button
body: <p>I want to create a MKUserTrackingBarButtonItem the same way iOS6 have it. Like a floating UIBarButtonItem. ( <a href="http://cl.ly/image/1Q1K2S1A1H3N" rel="nofollow">http://cl.ly/image/1Q1K2S1A1H3N</a> )</p>
  
  <p>Can you give some advice in how to achieve this?</p>
  
  <p>Thx!</p>