Hibernate version: 3.2.5ga

I have:

Class A

Class B extends A
Class C extends A

Table per subclass mapping (joined-subclass).

Class Z {
Set<A> items = new HashSet<A>
}

Items are mapped as many-to-many, through a xref table. What I would like to have is items contain all B and C instances found in the xref. What I get is just a list of A instances, I get the correct number of objects, but I would like the list to contain the full subclasses (I want to cast to them later). Is there anyway to do this?

Thanks!

-Nate