code: private void updateRegion() {
  		actMessage.setVisible(false);
  
  		String state = (String) stateSelector.getSelected();
  
  		if (STATE_ACT.equals(state)) {
  			actMessage.setVisible(true);
  			regionSelector.setOptions(new String[]{null, "Belconnen", "City", "Woden"});
  		} else if (STATE_NSW.equals(state)) {
  			regionSelector.setOptions(
  					new String[]{null, "Hunter", "Riverina", "Southern Tablelands"});
  		} else if (STATE_VIC.equals(state)) {
  			regionSelector.setOptions(
  					new String[]{null, "Gippsland", "Melbourne", "Mornington Peninsula"});
  		} else {
  			regionSelector.setOptions(new Object[]{null});
  		}
  	}
docs: Updates the options present in the region selector, depending on the state selector's value.