public boolean handleEvent(Event e) {
	switch (e.id) {
	  case Event.ACTION_EVENT:
	  // Handle other action events
		if (e.target instanceof Checkbox) {
		   String cbox = ((Checkbox)(e.target)).getLabel();
		   if (cbox.equals(st_poly_label)) {
		      target.setCurveType(InterpPanel.POLY);
		   } else if (cbox.equals(st_nat_spl_label)) {
		      target.setCurveType(InterpPanel.NAT_SPL);
		   }
		}
		target.repaint();
		return(true);
	  default:
		return(false);
	}
    }