title: jQuery UI buttonset disabled constructor option not working
body: <p>I have some buttonsets that contain radio inputs and want them to be disabled initially.</p>
  
  <p>Passing in the disabled option when constructing the buttonset doesn't work. </p>
  
  <pre><code>$("#a").buttonset({disabled: true});
  $("#b").buttonset({disabled: true});
  $("#c").buttonset({disabled: true});
  $("#d").buttonset({disabled: true});
  </code></pre>
  
  <p>However, calling the button disable method does.</p>
  
  <pre><code>$("#a").buttonset("disable");
  </code></pre>
  
  <p>Does anyone know why the first piece of code doesn't work? </p>