constraints.anchor = constraints.NORTH;
jfrm.getContentPane().add(gameboardPane, constraints);
/** Intercept Window Closure -- Confirm and gracefully exit */
jfrm.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
jfrm.addWindowListener(new WindowListener(){
public void windowActivated(WindowEvent arg0) {}
public void windowClosed(WindowEvent arg0) {
System.exit(0);
}
public void windowClosing(WindowEvent arg0) {