/** Removes action listener */
public synchronized void removeActionListener(ActionListener l) {
if (l != null) {
actionListener = AWTEventMulticaster.remove(actionListener, l);
}
}
/** Adds an action listener. */
public synchronized void addActionListener(ActionListener l) {
if (l != null) {
actionListener = AWTEventMulticaster.add(actionListener, l);
}
}