title: Two components with the same id ‘{}’ can’t be added to the application. AJAX
body: <p>I am aware that it is a well-known error. But the solutions available online are not working for me.</p>
  
  <p>I have AJAX calendar extender inside an updatepanel. 
  When I do postback, it is trying to create the AJAX extendar controls twice, hence the problem. </p>
  
  <p>Solutions available are saying to set debug=false, which makes the error disappear but duplicate controls are created on the page. 
  Each control is appearing twice. </p>
  
  <p>What else I could try?</p>
  
  <p>Thanks
  ARB</p>