code: function MenuCommand_createSeparator() {
                      // Make sure there's an input element
                      if (!this._element) {
                          this._element = _Global.document.createElement("hr");
                      } else {
                          // Verify the input was an hr
                          if (this._element.tagName !== "HR") {
                              throw new _ErrorFromName("WinJS.UI.MenuCommand.BadHrElement", strings.badHrElement);
                          }
                      }
                  }
docs: Private properties