code: private void addPathColumn() {
  
          Column<CmsHistoryResourceBean, ?> col = new TextColumn<CmsHistoryResourceBean>() {
  
              @Override
              public String getValue(CmsHistoryResourceBean historyRes) {
  
                  String path = historyRes.getRootPath();
                  String siteRoot = CmsCoreProvider.get().getSiteRoot();
                  if (path.startsWith(siteRoot)) {
                      path = path.substring(siteRoot.length());
                      if (!path.startsWith("/")) {
                          path = "/" + path;
                      }
                  }
                  return path;
              }
          };
          addColumn(col, CmsHistoryMessages.columnPath());
          setColumnWidth(col, 100, Unit.PCT);
      }
docs: Adds a table column.<p>