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/**
 * This method gets called when a bound property is changed.
 * @param e A <code>PropertyChangeEvent</code> object describing
 * the event source and the property that has changed. Must not be null.
 *
 * @throws NullPointerException if the parameter is null.
 * @since 1.5
 */
public void propertyChange(PropertyChangeEvent e) {
    String propertyName = e.getPropertyName();
    if (propertyName == "horizontalScrollBar" ||
    propertyName == "verticalScrollBar") {

    if (e.getNewValue() instanceof JScrollBar) {
        setScrollBarRelations((JScrollBar)e.getNewValue());
    }
    }
}