code: private void rebase() {
          for (int k = 0; k < flow.getWidgetCount(); k++) {
              Widget widget = flow.getWidget(k);
              String cellStyleName = getCellStyleName(k);
              removeAllCellStyles(widget.getElement());
              prepareCellPercentStyle(k, widget);
              widget.getElement().addClassName(cellStyleName);
          }
      }
docs: Update the stylesheets of all cells