How to pass complex type data on Ajax binding

Telerik ASP.NET MVC Q2 2011

I have a grid which is Ajax bound:

@(Html.Telerik().Grid<IUser>()
                .Name("UsersGrid")
                .DataBinding(binding => binding.Ajax().Select("UsersGridSelect", "User", new { area = "Admin" }))
                .ClientEvents(events => events.OnDataBinding("onGridRefresh"))
     ...
     ...

This is my onGridRefresh handler:

function onGridRefresh(e)
{
    var modelData =
    {
        Username:       $('#SearchModel_Username').val(),
        FirstName:      $('#SearchModel_FirstName').val(),
        LastName:       $('#SearchModel_LastName').val(),   
        IsLocked:       $('#SearchModel_IsLocked').is(':checked'),
        ClientId:       $('#SearchModel_ClientId').val(),
        UserCode:       $('#SearchModel_UserCode').val(),
        ExpireDateFrom: $('#SearchModel_ExpireDateFrom').val(),
        ExpireDateTo:   $('#SearchModel_ExpireDateTo').val()
    };

    e.data = { searchModel: modelData };
}

And this is my controller:

[GridAction]
public ActionResult UsersGridSelect(UserSearchModel searchModel)
{
    IList<IUser> userList = searchModel == null ? new List<IUser>() : _repository.GetUsers(searchModel);

    return View(new GridModel(userList));
}

This setup does not work, I know... But at least it demonstrates what I am after. When I pass in my values as seperate parameter it works:

public ActionResult UsersGridSelect(string Username, string Firstname, string LastName,....)

But I would prefere to pass it in as an object. Is there any way to accomplish that?

If you use e.data = modelData it will bind correctly.