title: yii datepicker is not displaying for some reason after using different theme
body: <p>I am using this datepicker widget it works fine when i do not use any theme and remain on the default theme of the yii. Recently i downloaded HEBO theme of yii from an online website but after applying that theme whenever i click on date field somethings happens in the background but unable to display the calender... </p>
  
  <p>Is it because of Z-Index? or something else? Kindly advice me how to display this widget properly</p>
  
  <pre><code>$this-&gt;widget('zii.widgets.jui.CJuiDatePicker',array(
    //  'name'=&gt;'publishDate',
      'model' =&gt; $model,
      'attribute' =&gt; 'issue_date',
      // additional javascript options for the date picker plugin
      'options'=&gt;array(
          'showAnim'=&gt;'fold',
      ),
      'htmlOptions'=&gt;array(
          'style'=&gt;'height:100px;'
      ),
  ));
  </code></pre>