title: UISegmentedControl deselect (make none of the segments selected)
body: <p>in fact the title contains my question.
  I have a UISegmentedControl, and need to deselect currently selected tab.
  I tried: </p>
  
  <pre><code>[menu setSelectedSegmentIndex:-1];
  </code></pre>
  
  <p>menu being the UBOutlet for uisegmentedcontrol but this gives me exception.
  anyone have some idea?
  thanks
  peter</p>