title: __doPostBack not working for updatepanel on page where enableviewstate=false
body: <p>I have an update panel on a page, and am using <code>__doPostBack</code> on a control inside the updatepanel called from javascript to do a postback and update the panel.</p>
  
  <p>Everything works fine, until I set <code>enableviewstate=false</code> on the page.</p>
  
  <p>The javascript still fires, but nothing happens on the server side.</p>