How do you avoid the n+1 problem with SubSonic?

foreach (BlogPost post in blogposts)
{
    foreach (Comment comment in post.Comments)
    {
        // Do something
    }
}

Partial Public Class Book

    Private _Author as Database.Author
    Property Author() as Database.Author
      Get
         If _Author is nothing then
           ' Load the author class here.
         End if
         return _Author
      End get
      Set
         '....
      End Set
    End Property

End Class