public void addTitlePrefix(String prfx){
  if (!titlePrefix.contains(prfx)) {
    titlePrefix.add(prfx);
    firePropertyChange(TITLE_PREFIX,null,titlePrefix);
  }
}

public void addTitlePrefix ( String prfx ) { if ( ! titlePrefix . contains ( prfx ) ) { titlePrefix . add ( prfx ) ; firePropertyChange ( TITLE_PREFIX , null , titlePrefix ) ; } }
adds a title prefix .
