title: Setting returnURL for CButtonColumn button
body: <p>I'm looking at the controller for the default Delete button in the CButtonColumn class. It manages to return to the previous web-page after deleting a CGridView line and remain on the same page of the CGridView, as opposed to going to the first page. The lines responsible for this in the associated controller seem to be:</p>
  
  <p><code>
  if (!isset($_GET['ajax']))
      $this-&gt;redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] : array('admin'));
  </code></p>
  
  <p>I would like to create a new custom button that has this behavior (i.e. returning to the previous view without resetting the pagination to page 1), but simply including the above lines of code in the button's associated action does not do the trick. I think I need to send that 'returnUrl' parameter somehow, but I cannot figure out how :)</p>