Still need foreign key properties in CodeFirst?

modelBuilder.Entity<Parent>().HasMany(parent=>parent.Children).WithRequired(child=>child.Parent);

Is this enough or DevForce needs this fk properties for it's internal infrastructure? Are additional benefits of using fk properties present?

    public class Parent
    {
        public RelatedEntityList<Child> Children { get; set; }
    }
 
    public class Child
    {
        public Parent Parent { get; set; }
        public int ParentId { get; set; } // can we omit this "buddy" property according this blog post http://msdn.microsoft.com/en-us/data/hh134698
    }
 
    public class MyDbContext : DbContext
    {
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Parent>().HasMany(parent => parent.Children).WithRequired(child => child.Parent);
        }
    }