/// <summary>
/// Creates a <see cref="Microsoft.Practices.EnterpriseLibrary.Validation.Validator"/> that will validate
/// a field with a domain list of allowable values.
/// </summary>
/// <param name="optionList">The list of valid options.</param>
/// <returns>A <see cref="Microsoft.Practices.EnterpriseLibrary.Validation.Validator"/> that will validate
/// a field with a domain list of allowable values.</returns>
private Validator CreateValidatorForOptions(ControlValueOptionList optionList)
{
string[] optionValues = optionList.Select(x => x.Value).ToArray();
return new NullableDomainValidator<object>(ValidationMessage.InvalidOption, optionValues);
}
