public void startButtonChange(ActionEvent e){
  firePropertyChangeEvent(new PropertyChangeEvent(this,"start",engine_started,start_button.isSelected()));
  engine_started=start_button.isSelected();
}

public void startButtonChange ( ActionEvent e ) { firePropertyChangeEvent ( new PropertyChangeEvent ( this , "start" , engine_started , start_button . isSelected ( ) ) ) ; engine_started = start_button . isSelected ( ) ; }
respond to a start button press
