[Solved] Client validation

[Yura]

Hi, I have a little problem but cant fix it.
My model and view:

 
public class WrapperModel
 {
      public IEnumerable<SelectListItem> NegotiatorIdName { get; set; }
}

@Html.Telerik().ComboBox().Name("SelectedNegotiator").BindTo(Model.NegotiatorIdName)

And I need to check if user select some value from combobox before submit form that contains it.
Thanks