public Property addParameter(int param) { return addProperty(PROP_PARAM + nParameters++, new Integer(param));
public Property addParameter(final int param) { Property result = addInvisibleProperty(PROP_PARAM + nParameters++, new Integer(param));  return result;
  public Property addParameter(int param) {    return addProperty(PROP_PARAM + nParameters++, new Integer(param));  }