I wanted to do a transmog run but am unable to because Razorgore event in Blackwing Lair is impossible, as with the new UI my own action bar no longer changes and the pet bar DOES NOT APPEAR at all when possessing him so his abilities do not come up and I am unable to destroy the eggs.
Just did this, and the pet bar replaced my main bar, just ran around the room pressing 2 and finished in no time.
Just tried it earlier with my Hunter and ran into this same issue. Pet is dismissed.