title: How to change UIBarButtonItem style?
body: <p>I try to change the style of a UIBarButtonItem when a user select a row in a tableView</p>
  
  <p>I use it:
  [btnValided setStyle:UIBarButtonItemStyleDone];
  [btnValided setEnabled:YES];</p>
  
  <p>But it's not good (setEnabled is good)</p>
  
  <p>Have an idea?</p>
  
  <p>Thanx for help :)</p>