NHIbernate Mapping By Code; Unable to add column prefix like Fluent Nhibernate

Question

I have been searching for a while with no success. I'm implementing a new solution using NHibernate mapping by code and creating a reusable component like the following:

public class AuditTag
{
    public AuditTag() {}

    public string Username { get; private set; }

    public string UserDisplay { get; private set; }

    public DateTime TimeOccurred { get; private set; }
}

Then the mapping define as follows:

public class AuditTagMap : ComponentMapping<AuditTag>
{
    public AuditTagMap()
    {
        Property(x => x.Username, x =>
        {
            x.Column("username");
        });

        Property(x => x.UserDisplay, x =>
        {
            x.Column("userdisplay");
        });

        Property(x => x.TimeOccurred, x =>
        {
            x.Column("timeoccurred");
        });
    }
}

And on the entity the Mappping is defined as follows:

... previous code not shown ...
            Property(x => x.ArchiveFolder, x =>
            {
                x.Type(NHibernateUtil.String);
                x.Column("archivefolder");
            });

            Component(x => x.CreatedAudit);

            Component(x => x.UpdatedAudit);

            Component(x => x.LastFileProcessedAudit);
        }
    }

When using the component on an entity, this three attributes are defined as Properties on the entity itself.

Component(x => x.CreatedAudit);

Component(x => x.UpdatedAudit);

Component(x => x.LastFileProcessedAudit);

The problem is previously using Fluent NHibernate we were able to set the column prefix on the entity mapping using the following method:

Component(x => x.UpdateAudit).ColumnPrefix("updateaudit_");

I haven't found similar functionality when using NHibernate mappings by code.

Anybody has found a similar issue and even better a way to do it?