title: Jquery modalpopupextender hiding in contentplaceholder
body: <p>On default.aspx page that created by using a master page has a content place holder. And there is a modalpopupextender in that placeholder. I am tring to reach modalpopupextender with jquery and close it by pushing ESC keyboard button. I have tried these; </p>
  
  <pre><code> $(document).keyup(function(e) {
    if (e.keyCode == 27) { 
      $find('#&lt;%= ModalPopupExtender1.ClientID %&gt;').hide(); // doesnt work !!!
          $find('&lt;%= ModalPopupExtender1.ClientID %&gt;').hide(); // doesnt work !!!
          $find('ModalPopupExtender1.ClientID').hide(); // doesnt work !!!
      $find('ModalPopupExtender1').hide(); // doesnt work !!!
  
  }
  });
  </code></pre>