code: @Override
      protected UIStructurBrowser getNewStructurBrowser(final Instance _instance,
                                                        final UIStructurBrowser _parent)
          throws EFapsException
      {
          final FieldTable field = FieldTable.get(((UIFieldStructurBrowser) _parent).getFieldTabelId());
          final UIFieldStructurBrowser ret = new UIFieldStructurBrowser(_parent.getCommandUUID(), _instance == null
                          ? null : _instance.getKey(), _parent.getSortDirection(), field);
          ret.setParentBrws(this);
          ret.setLevel(getLevel() + 1);
          return ret;
      }
docs: {@inheritDoc}