public void addPartner(Element element){
  if (!hasPartner(element)) {
    partners.add(new PartnerHolder(element));
  }
}

public void addPartner ( Element element ) { if ( ! hasPartner ( element ) ) { partners . add ( new PartnerHolder ( element ) ) ; } }
adds a partner element to this controller . see class javadoc for an explanation of the interaction between partner elements .
