Place chicken and dressing in a zip-top plastic freezer bag; seal and chill 2 hours, turning occasionally. Remove chicken from marinade, discarding marinade.
Grill chicken, covered with grill lid, over medium-high heat (350° to 400°) 5 to 7 minutes each side or until done. Remove from grill, and let stand 15 minutes; coarsely chop.
Heat sesame seeds in a small nonstick skillet over medium-low heat, stirring often, 4 minutes or until toasted.
Stir together grilled chicken, sesame seeds, artichoke hearts, and remaining ingredients in a large bowl just until blended.