Castle.Components.Validator attributes aren't validating

[Lionhunter]

Within a Monorail project, I have the following class which uses the Castle.Components.Validator validation attributes:

public class NewProductViewModel
    {
        [ValidateNonEmpty("Name is a required field")]
        public string Name { get; set; }

        [ValidateDecimal("Price must be a decimal")]
        public decimal Price { get; set; }

        [ValidateInteger("SupplierId must be an integer")]
        public int SupplierId { get; set; }
    }

which gets passed as a parameter in this controller's action:

[AccessibleThrough(Verb.Post)]
        public void Create([DataBind("newproductviewmodel", Validate = true)] NewProductViewModel prod)
        {
            if (!HasValidationError(prod))
            {
                Logger.InfoFormat("The following NewProductViewModel has been received:{0}", prod.ToString());
                var tx = _session.BeginTransaction();
                try
                {
                    Logger.InfoFormat("Retrieving supplier with id <{0}> from database", prod.SupplierId);
                    var supplier = _session.Load<Supplier>(prod.SupplierId);
                    var newProduct = new Product()
                    {
                        Supplier = supplier,
                        Price = prod.Price,
                        Name = prod.Name
                    };
                    _session.Save(newProduct);
                    tx.Commit();
                    RedirectToAction("list");
                }
                catch (Exception ex)
                {
                    Flash["error"] = ex.Message;
                    Flash["newproductviewmodel"] = prod;
                    Logger.ErrorFormat("The following error has occured:{0}", ex.Message);
                    RedirectToAction("new");
                }
                finally
                {
                    tx.Dispose();
                }
            }
            else
            {
                Logger.ErrorFormat("The following NewProductViewModel is invalid:{0}", prod.ToString());
                Flash["contact"] = prod;
                Flash["error"] = GetErrorSummary(prod);
                RedirectToAction("new");
            }
        }

However, if i set the Price to a value of "fadaadsa" instead of a decimal, the HasValidationError doesn't say anything! Instead, it maps the Price property to 0. I'm not sure what I should do, considering that the documentation pretty much says that this is all there is to it. Thanks in advance.