title: iphone UIBarButtonItem initWithImage - doesn't highlight when tapped
body: <p>I can create a button like this, and the action works fine:</p>
  
  <pre><code>UIBarButtonItem *myBtn = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"image.png"] style:UIBarButtonItemStyleBordered target:self action:@selector(myMethod:)];
  </code></pre>
  
  <p>However, when tapping the button on screen, no Down state highlight is displayed. I've tried everything. Can you not get a highlight on a UIBarButtonItem with a custom image?</p>