docs: function () {
              if (this._cfg.waiAria) {
                  // it is important to set aria-owns and aria-expanded attributes before
                  // calling the parent _afterDropdownOpen method (which gives focus to
                  // the calendar)
                  var dropDownIcon = this._getDropdownIcon();
                  var calendarId = this.controller.getCalendar().getCalendarDomId();
                  dropDownIcon.setAttribute("aria-owns", calendarId);
                  dropDownIcon.setAttribute("aria-activedescendant", calendarId);
                  dropDownIcon.setAttribute("aria-expanded", "true");
              }
              this.$DropDownTextInput._afterDropdownOpen.apply(this, arguments);
          }