title: UIButton setTitleColor:forState: question
body: <p>Why does the following code work...</p>
  
  <pre><code>[signInBtn setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
  [signInBtn setTitleColor:[UIColor blackColor] forState:UIControlStateDisabled];
  </code></pre>
  
  <p>while this does not?</p>
  
  <pre><code>[signInBtn setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted|UIControlStateDisabled];
  </code></pre>