code: public void openSiteMap(String sitePath, boolean siteChange) {
  
          String uri = CmsCoreProvider.get().link(
              CmsCoreProvider.get().getUri()) + "?" + CmsCoreData.PARAM_PATH + "=" + sitePath;
          if (!siteChange) {
              uri += "&" + CmsCoreData.PARAM_RETURNCODE + "=" + getData().getReturnCode();
          }
          Window.Location.replace(uri);
      }
docs: Opens the site-map specified.<p>
  
  @param sitePath the site path to the site-map folder
  @param siteChange in case the site was changed