title: How do I create (alloc/initwithImage) a UIBarButtonItem?
body: <p>Is this the proper way to allocate and initialize a UIBarButton item with an image?</p>
  
  <pre><code>UIBarButtonItem *barBtn = [[UIBarButtonItem alloc]initWithImage:@"back_topbtn.png" style:UIBarButtonItemStyleDone target:nil action:nil];
  </code></pre>