title: beforeShow event not firing on jQueryUI Datepicker
body: <p>No matter what I try, I'm not able to get the beforeShow event to fire on my datepicker.  Here's my code:</p>
  
  <pre><code>$('#calendar').datepicker({
  inline: true,
  dateFormat: 'mm,dd,yy',
  beforeShow: function(input, inst) { alert('before'); }
  });
  </code></pre>
  
  <p>I've added beforeShowDay and onSelect events to my datepicker, and they do fire correctly.  Has anyone else had trouble with this?</p>