title: How do you use the jQuery blockui add-in with MVC Ajax?
body: <p>I have been reading the post here:</p>
  
  <p><a href="http://encosia.com/2008/10/04/using-jquery-to-enhance-aspnet-ajax-progress-indication/" rel="nofollow noreferrer">http://encosia.com/2008/10/04/using-jquery-to-enhance-aspnet-ajax-progress-indication/</a></p>
  
  <p>But it wants to use the following object:</p>
  
  <pre><code>Sys.WebForms.PageRequestManager.getInstance()
  </code></pre>
  
  <p>Which doesn't exist when using the MVC AJAX code.  Has anyone tried to hook when the postback ends from MVC AJAX to know when to unblock the UI?</p>