How to get the object instance in IMetadataAware.OnMetadataCreated

Question

I need to use DisplayAttribute to display a different text in a form of the view, depending on some condition. That condition uses other property of the model.

For instance, in this HTML helper:

@Html.LabelFor(m => m.MyProperty)

I need to render a different label depending on the dynamic condition.

Since DisplayAttribute cannot be inheritted, I created a new attribute this way:

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Method, AllowMultiple = false)]
public sealed class DisplayByTypeAttribute : Attribute, IMetadataAware
{
    public string OtherPropertyName { get; set; }

    public string NameIfWorker { get; set; }

    public string NameIfStudent { get; set; }

    public DisplayByTypeAttribute(string otherPropertyName, string nameIfWorker, string nameIfStudent)
    {
        this.OtherPropertyName = otherPropertyName;
        this.NameIfWorker = nameIfWorker;
        this.NameIfStudent = nameIfStudent;
    }

    public void OnMetadataCreated(ModelMetadata metadata)
    {
        PropertyInfo empresaProp = metadata.ContainerType.GetProperty("EmpresaId");
        if (empresaProp == null || metadata.Container == null)
            metadata.DisplayName = NameIfWorker ?? string.Empty;
        else
        {
            int empresaId = (int)empresaProp.GetValue(metadata.Container);
            if (empresaId > 0)
            {
                using (Repositories.GestionCasinoCentralEntities db = new Repositories.GestionCasinoCentralEntities())
                {
                    string tipoBeneficiario = db.Empresa.Find(empresaId).EmpresaTipoBeneficiario;
                    if (tipoBeneficiario == Helpers.TipoBeneficiario.EstudianteCodigo)
                        metadata.DisplayName = NameIfStudent ?? NameIfWorker ?? string.Empty;
                    else
                        metadata.DisplayName = NameIfWorker ?? string.Empty;
                }
            }
        }
    }
}

OnMetadataCreated has a parameter that contains 2 interesting properties: Container and ContainerType.

ContainerType has the model type where the property is in, however, Container is null, even when there is an instance of the model.

Is there a way to do what I am trying to do?