code: function () {
                  eventUtil.addListener(Aria.$window.document.body, "mousedown", {
                      fn : this._onMouseDown,
                      scope : this
                  });
                  eventUtil.addListener(Aria.$window.document.body, "touchstart", {
                      fn : this._onMouseDown,
                      scope : this
                  });
              }
docs: This method is called when AriaWindow sends an attachWindow event. It registers a listener on the
  mousedown event.