Preheat grill to medium heat. Pour 1/4 cup of the dressing over chicken in shallow dish or resealable plastic bag. Refrigerate 10 minute or up to 24 hours to marinate.
Mix remaining 1/4 cup dressing, the barbecue sauce and marmalade; set aside.
Place chicken on grill; cover. Grill 12 to 15 minute or until cooked through (170°F), turning occasionally and brushing with sauce mixture during last few minutes of cooking. Let stand, covered with foil, for a few minutes before serving.