Como vincular objetos aninhados no HttpPost no asp.net MVC

Comecei a implementar esta soluçãoO atributo bind inclui e exclui propriedades com objetos aninhados de tipo complexo

mas não funciona.

A mesma pergunta está aquiModelo aninhado de ligação com MVC3 no HttpPost

mas nenhuma resposta concreta.

Modelo

[Bind(Include = "FirstName,MiddleName,LastName,Position,TruckTypeID,Direction,Organization,Objective,TimeStart,TimeEnd")]
public partial class UserRequestRegisterModel
{
    [DisplayName("Имя")]
    [Required]
    public string FirstName { get; set; }

    [DisplayName("Фамилия")]
    [Required]
    public string MiddleName { get; set; }

    [DisplayName("Отчество")]
    [Required]
    public string LastName { get; set; }

    [DisplayName("Должность")]
    [Required]
    public string Position { get; set; }

    [DisplayName("Тип транспорта")]
    [Required]
    public System.Guid TruckTypeID { get; set; }

    [DisplayName("Направление")]
    [Required]
    public string Direction { get; set; }

    [DisplayName("Организация")]
    [Required]
    public string Organization { get; set; }

    [DisplayName("Цель")]
    [Required]
    public string Objective { get; set; }

    [DisplayName("Время убытия")]
    [Required]
    // [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy  HH:mm}", ApplyFormatInEditMode = true)]
    public System.DateTime TimeStart { get; set; }

    [DisplayName("Время прибытия")]
    [Required]
    // [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy HH:mm}", ApplyFormatInEditMode = true)]
    public Nullable<System.DateTime> TimeEnd { get; set; }        
}


[Bind(Include = "UserRequest")]
public partial class RequestUserModel
{
    public List<UserRequestViewItem> UserRequestViewItems { get; set; }
    public UserRequestRegisterModel UserRequest { get; set; }

    public RequestUserModel()
    {
        UserRequestViewItems = new List<UserRequestViewItem>();
        UserRequest = new UserRequestRegisterModel();
    }
}

Controlador

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Index([Bind(Include = "FirstName,MiddleName,LastName,Position,TruckTypeID,Direction,Organization,Objective,TimeStart,TimeEnd")] RequestUserModel userRequest)
//public ActionResult Index(RequestUserModel userRequest)
{
    // !  userRequest.UserRequest is empty  !
    //...
}

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