code: private void updateButtonBars() {
  
          List<I_CmsEditableGroupRow> rows = getRows();
          int i = 0;
          for (I_CmsEditableGroupRow row : rows) {
              boolean first = i == 0;
              boolean last = i == (rows.size() - 1);
              row.getButtonBar().setFirstLast(first, last, m_hideAdd);
              i += 1;
          }
      }
docs: Updates the button bars.<p>