public boolean getFillBox() {
        return this.fillBox;
    }

    /**
     * Sets the flag that controls whether or not the box is filled and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param flag  the flag.
     *
     * @see #getFillBox()
     */
    public void setFillBox(boolean flag) {
        this.fillBox = flag;
        fireChangeEvent();