code: private void addUserLastModifiedColumn() {
  
          addColumn(CmsHistoryMessages.columnUserLastModified(), 120, new TextColumn<CmsHistoryResourceBean>() {
  
              @Override
              public String getValue(CmsHistoryResourceBean historyRes) {
  
                  return historyRes.getUserLastModified();
              }
          });
      }
docs: Adds a table column.<p>