gistfile1.js

$(window).bind("cuePoint", function(event, action) {
  self.onCuePoint(action); // action = { eventType: ..., value: ... }
});

onCuePoint: function(action) {
  if (action.eventType == "slideChange") {
    this.collection.currentActive = action.value;
    this.collection.setActive(action.value);
  }
}