HEAT grill to medium heat.
MIX barbecue sauce, zest and juice until blended.
GRILL chicken 6 min., turning after 3 min. Brush with half the sauce.
ADD vegetables to grill. Cook chicken and vegetables 9 to 12 min. or until chicken is done (165ºF) and vegetables are crisp-tender, turning and brushing chicken occasionally with remaining sauce and brushing vegetables with dressing.