/** begin displaying the message */
public void begin() {
g2d.clearAll = false;
g2d.paintAll = false;
super.start();
}
/** end displaying message and force a graph repaint */
public void end() {
super.stop();
g2d.clearAll = true;
g2d.paintAll = true;
if (lg != null) lg.dispose();
g2d.repaint();
}