title: ios change subview index runtime
body: <p>i intend to do some menu with tabs,</p>
  
  <p>if I have the tabs ordered with z index, and i insert each tab with:</p>
  
  <blockquote>
    <p>insertSubview:(UIView *) atIndex:(NSInteger)</p>
  </blockquote>
  
  <p>and by pressing a button on top of them I want to change the tab shown, on top</p>
  
  <p>how can I change the subview index at runtime?</p>
  
  <p>thanks!</p>