MVC 3 Ajax.ActionLink无法正常工作

I'm playing around with the some MvcMusicStore example based shop and having some problems with the MVC3 Ajax.ActionLink / Ajax.RouteLink helpers. The problem is that it simply does not generate an Ajax request (Request.IsAjaxRequest() == false). The forms I'm generating using the Ajax.BeginForm / Ajax.BeginRouteForm are working nicely though. I'm playing around with the some MvcMusicStore