title: How to call a client side javascript function after a specific UpdatePanel has been loaded
body: <h2>How is it possible to call a client side javascript method after a <em>specific</em> update panel has been loaded?</h2>
  
  <p><strong><code>Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler)</code></strong> does not work for me because this will fire after ANY update panel finishes loading, and I can find no client side way to find which is the one</p>
  
  <p><strong><code>ScriptManager.GetCurrent(Page).AsyncPostBackSourceElementID AsyncPostBackSourceElementID</code></strong> does not work for me as this is a server side object, and i want Client Side</p>
  
  <p>The ClientSide .Net framework must know which UpdatePanel it is updating in order to update the correct content.  Surely there is a way to hook into this event?</p>
  
  <p>Any help would be appreciated. </p>