public void addCustomTickLabel(final String TICK_LABEL){
  if (null == TICK_LABEL)   return;
  if (!customTickLabels.contains(TICK_LABEL))   customTickLabels.add(TICK_LABEL);
  fireUpdateEvent(REDRAW_EVENT);
}

public void addCustomTickLabel ( final String TICK_LABEL ) { if ( null == TICK_LABEL ) return ; if ( ! customTickLabels . contains ( TICK_LABEL ) ) customTickLabels . add ( TICK_LABEL ) ; fireUpdateEvent ( REDRAW_EVENT ) ; }
adds the given string to the list of custom ticklabels
