HEAT grill to medium-high heat.
GRILL steak 4 to 5 min. on each side or until medium doneness, brushing with steak sauce for the last minute. Remove from grill; cover loosely with foil. Let stand 5 min. Meanwhile, grill tortillas 15 to 30 sec. on each side or just until warmed.
COMBINE remaining ingredients.
CUT meat across the grain into thin slices. Serve with tortillas and bean mixture.