SQL 2008 Time(7) to TimeSpan

I know there are several posts on this subject, but they all seem outdated now. So I am wondering if someone can help with this problem.

I have created a convertor useing the following code.

public class SqlNativeTimeSpanConverter : IFieldConverter
{
    public object ConvertFromDatabase(object databaseValue)
    {
       return databaseValue == DBNull.Value ? null : databaseValue;
    }

    public object ConvertToDatabase(object value)
    {
        return value;
    }
}

The I have created a UDT as per the attached screenshot.

Then for each field, in an entity that should be a Time type I have selected the type as SQLTime, the name of the UDT. The code appears to work, throws no errors, but the time is not actually saved in the database.

Can anyone please tell me where I have gone wrong.

Thanks

This is currently being covered in http://www.mindscapehq.com/forums/thread/3177 for any future reference.

Jeremy