title: UITabBar setSelectionIndicatorImage in iOS 4
body: <p>i want know how i can use an image to the selected item in a UITabBar, in ios5 i'll do in this way:</p>
  
  <pre><code>[[myTabBar tabBar] setSelectionIndicatorImage:[UIImage imageNamed:@"TabBar_Activated.png"]];
  </code></pre>
  
  <p>but in iOS 4 that line give me an error, how i can do?</p>