docs: function (comp, callback, callbackOff) {
  		var justHit = false;
  		this.bind("EnterFrame", function () {
  			var hitdata = this.hit(comp);
  			if (hitdata) {
  				justHit = true;
  				callback.call(this, hitdata);
  			} else if (justHit) {
  				if (typeof callbackOff == 'function') {
  					callbackOff.call(this);
  				}
  				justHit = false;
  			}
  		});
  		return this;
  	}