title: jquery does div contain children of a certain class
body: <p>I have an event handler that triggers an event handler that needs to test if the children of a div contain a certain class.</p>
  
  <p>For now, I'm doing this:</p>
  
  <pre><code>$('#Container .DivData').live({
    mouseenter: function () {
      if ($(this).find('.HiddenData')) {
        // do something
         } ....
  </code></pre>
  
  <p>The problem is that it always seems to find HiddenData even though sometimes there is none.</p>
  
  <p>What's the problem here?</p>