} else { Log.warn("in Parameter,addValueGroup(). ValueGroup passed in is null"); return null; }
  public ValueGroup addValueGroup (ValueGroup group) {    if (group !=null) {      //add the group to the groupOwnedHash      valueGroupOwnedHash.add(group);      return group;    }    else {      Log.warn("in Parameter,addValueGroup(). ValueGroup passed in is null");      return null;    }  }