[Solved] MVC Grid validation with EqualToAttribute allways fails on Edit

[Somename]

MVC Grid validation with EqualToAttribute allways fails - shows that 'PasswordConfirm' and 'Password' do not match. (fails client side, server controller action isn't hit). FF4.0.1, IE9

public class PersonViewModel
    {
        [Key]
        public int Id { get; set; }

        [Required]
        [Email]
        public string Email { get; set; }

        [Required]
        public string Password { get; set; }

        [Required]
        [EqualTo("Password")]
        public string PasswordConfirm { get; set; }

        [Url]
        public string HomePage { get; set; }

        [Integer]
        [Min(1)]
        public int Age { get; set; }
    }

View:

@using Telerik.Web.Mvc.UI
@model IEnumerable<TelerikMvc.Models.PersonViewModel>
@{
    ViewBag.Title = "PersonList";
}
<h2>
    PersonList</h2>
<p>
    @Html.ActionLink("Create New", "Create")
</p>
@{
    Html.Telerik().Grid(Model)
        .Name("GridPersons")
        .ToolBar(commands => commands.Insert())
        .DataKeys(cfg => cfg.Add(model => model.Id))
        .Columns(col =>
        {
            col.Command(cmd =>
            {
                cmd.Edit();
                cmd.Delete();
            }).Width(200);
            col.Bound(o => o.Id);
            col.Bound(o => o.Email);
            col.Bound(o => o.HomePage);
            col.Bound(o => o.Password);
            col.Bound(o => o.PasswordConfirm);
        })
    .Sortable()
    .EnableCustomBinding(true)
    .Pageable(cfg => cfg.PageSize(5).Total((int)ViewData["total"]))
    .DataBinding(db => db.Ajax()
        .Select("_AjaxSelectAction", "Home")
        .Update("_AjaxUpdateAction", "Home")
        .Delete("_AjaxDeleteAction", "Home")
        .Insert("_AjaxInsertAction", "Home"))
    .Render();
}

Controller (fragment):

[GridAction(EnableCustomBinding = true)]

 public ActionResult _AjaxUpdateAction(int id)

 {

     var person = Persons.Where(x => x.Id == id).SingleOrDefault();

     if (TryUpdateModel(person))

     {

         //some saving method


     }

     return View(new GridModel { Data = GetData(new GridCommand()), Total = 500 });

 }