private NestedTable setNestedTable(int level, Structure s) {
    NestedTable ntable;
    if (nestedTableList.size() < level + 1) {
      ntable = new NestedTable(level);
      nestedTableList.add(ntable);

    } else {
      ntable = nestedTableList.get(level);
    }

    if (s != null) // variables inside of records
    ntable.table.setBeans(getStructureVariables(s));

    ntable.show();
    return ntable;
  }