code: public void setHighlightAreas(final boolean HIGHLIGHT) {
          if (null == highlightAreas) {
              _highlightAreas = HIGHLIGHT;
              fireUpdateEvent(REDRAW_EVENT);
          } else {
              highlightAreas.set(HIGHLIGHT);
          }
      }
docs: Defines if areas should be highlighted in case they
  contain the current time.
  @param HIGHLIGHT