Why doesn't extending the flaps on a B-2 send it into an uncontrollable dive? The Northrop-Grumman B-2, a tailless-flying-delta-wing aircraft, has a set of flaps along its trailing edge, as seen (for instance) in this cutaway diagram:



(Image from Funker530.)

But tailless delta-winged aircraft (except for those few equipped with canards) can't generally use flaps, because a tailless canardless delta-winged aircraft has no way of countering the nosedown pitching moment produced by extended flaps.

How does the B-2 avoid pitching down uncontrollably when its flaps are extended?
I don't think the flaps are used as high lift devices. Watch this video of a B-2 landing. Perfect view: