title: How to set default value in dropdown
body: <p>i have a dropdown here in yii that looks like this: </p>
  
  <pre><code>&lt;?php echo $form-&gt;dropDownList($model, 'is_enabled', 
  array('0'=&gt;'No', '1'=&gt;'Yes'), array('id'=&gt;'new-sys-user-is_enabled',));?&gt;
  </code></pre>
  
  <p>the problem with this is that it shows the 'No' because it has the 0 key. I would like to show the 'Yes' by default. What is the work-around for this? </p>