asp.net mvc - Is Request.IsAjaxRequest() broken in the MVC RC1 refresh? -

This MVC stuff is fun but the way in which each step is another small obstacle.

I'm just using this for the first time in conjunction with Microsoft's AJAX library today. I'm not using jQuery yet (I had to mention this because I just hyperlink a question about jQuery!).

Unfortunately I had installed this code before testing.

I Ajax.BeginForm .

  using <% (Ajax.BeginForm ("Contact", "AboutUs", New AjaxOptions New, {id = "fooForm"}))   Pre> 
 When my controller action is executed, these are my headers: 
 
 
 Connection Pragma, content-length, content-type, accept, accept-encoding, accept In addition, this param is included in the FORM 
 
  request ["__MVCASYNCPOST"] - Language, host, referrer, user-agent, UA-CPU   
 = "True"  
 
 and the end effect That makes it all wrong! 
 
  request. ISAZXRUEST ()  
 
 I get problems with Chrome and Internet Explorer 
 
 Please tell me if I am doing something silly - or if something just broke 
 
  Last thought:  Hmm - maybe I'm going to get a new futures DLL I would update if it is a problem 
 

Thank you for the Phil for MicrosoftMvcAjax.js. Although it did not really tell me in the release notes that I need to update them.

PHIL: If you want points for the correct answer then you have 2 days until I can accept my answer. Thanks!