code: function () {
                  var res = idMgr.getId();
                  if (this._dynamicIds) {
                      this._dynamicIds.push(res);
                  } else {
                      this._dynamicIds = [res];
                  }
                  return res;
              }
docs: Create a dynamic id to be used in the markup generated by the widget in order to get a reference to the
  corresponding DOM element later (for example in initWidget).
  @return {String}