docs: function(component, callbackOn, callbackOff) {
          var justHit = false;
          this.bind("UpdateFrame", function() {
              var hitData = this.hit(component);
              if (hitData) {
                  callbackOn.call(this, hitData, !justHit);
                  justHit = true;
              } else if (justHit) {
                  if (typeof callbackOff === "function") {
                      callbackOff.call(this);
                  }
                  justHit = false;
              }
          });
          return this;
      }