Normalizing EnumStringType in NHibernate

public enum UploadMethod
{
    Java, Silverlight, Gears, Flash
}

class UploadMethodType : EnumStringType
{
    public UploadMethodType() : base(typeof(UploadMethod), 255) { }
}

public class Person
{
    /* Bunch of non interesting properties... */
    public UploadMethod PreferredUploadMethod { get; set; }
}

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
 <class name="Person" lazy="false" table="[dbo].[People]">
  <!-- Bunch of non interesting properties... -->
  <property name="PreferredUploadMethod" type="UploadMethodType" />
 </class>
</hibernate-mapping>