Fluent NHibernate + Disable LazyLoad

Hey there, I've tried to disable LazyLoad on my collections without luck... The code I've tried so far is:

// Person.cs

public class Person
{
    public virtual int Id { get; private set; }
    public virtual string FirstName { get; set; }
    public virtual IList<Car> Cars { get; set; }

    public Person()
    {
        Cars = new List<Car>();
    }

    public virtual void AddCar(Car car)
    {
        Cars.Add(car);
    }
}

public class PersonMap : ClassMap<Person>
{
    public PersonMap()
    {
        Id(x => x.Id);
        Map(x => x.FirstName);
        HasMany(x => x.Cars).KeyColumn("PersonId").Cascade.AllDeleteOrphan().Not.LazyLoad();
        Table("Persons");
    }
}

// Car.cs

public class Car
{
    public virtual int Id { get; set; }
    public virtual string CarName { get; set; }
    public virtual Person Person { get; set; }
}

public class CarMap : ClassMap<Car>
{
    public CarMap()
    {
        Id(x => x.Id);
        Map(x => x.CarName);
        HasOne(x => x.Person).Not.LazyLoad();
        Table("Cars");
    }
}

Any suggestions?

Thanks in advance!