trigger problem

Now, I have 2 objects( AA and BB), and 1 trigger.
How do I make BB diable to occur callback response?

AA <- group 1
BB <- group 2
Trigger <- group 3

and I do this:
phyScene->getNxScene()->setGroupCollisionFlag(1,2,true);
phyScene->getNxScene()->setGroupCollisionFlag(2,3,false);
phyScene->getNxScene()->setGroupCollisionFlag(1,3,true);

but fail.........

I also have the same problem, i couldn't manage to do that