public bool validate()
        {
            foreach (Control c in this.Controls)
                if (!validateControl(c))
                    return false;

            return true;
        }

        private bool validateControl(Control ctrl)
        {
            var validator = ctrl as BaseValidator;
            if (validator != null)
            {
                validator.Validate();
                if (!validator.IsValid)
                    return false;
            }

            foreach (Control c in ctrl.Controls)
                if (!validateControl(c))
                    return false;

            return true;
        }