ajax.beginform onfailure,asp.net mvc 3 - Ajax.BeginForm OnFailure invoked with Response, not AjaxCon...

When writing Ajax data entry forms in my ASP.NET MVC3 app, I have a standard Ajax error handler, along the lines of:

function handleAjaxError(ajaxContext) {

var response = ajaxContext.get_response();

var statusCode = response.get_statusCode();

alert("Request failed, status code " + statusCode);

}

I'm now finding that the parameter sent to handleAjaxError isn't an Ajax context but the Response object itself, for some reason.

Is this a known behavior change in MVC3, maybe? Here's the form setup, if that's relevant:

@using (Ajax.BeginForm("Create", "Attendance", null, new AjaxOptions

{ OnFailure = "handleAjaxError",

OnSuccess = "alert('success')" },

new { id = "frmCreateException" }))

{

@Html.EditorFor(m => Model)

}

The controller action returns a PartialViewResult. The HTTP Exception at the moment is a 500, because I haven't yet created the view.

Thanks!