setBorder(new WidgetBorder(getBorder(), WidgetBorderType.LOWERED));
if (getBorder() != null) setBorder(new WidgetBorder(getBorder(), WidgetBorderType.LOWERED));
    public void doMouseButtonDown() {        if (this.buttonState != WidgetButtonStateType.BUTTON_DOWN) {            this.buttonState = WidgetButtonStateType.BUTTON_DOWN;            setBorder(new WidgetBorder(getBorder(), WidgetBorderType.LOWERED));            getNotifierMouseButtonDown().notifyObservers(this);        }    }