docs: function () {
              var options = this._dataModel.listContent, value;
              for (var i = 0, len = options.length; i < len; i++) {
                  value = options[i].value + "";
                  if (value.indexOf(this._separator) != -1) {
                      this.$logError(this.INVALID_MULTISELECT_CONTENT);
                      break;
                  }
              }
  
          }