public void setLabelInsets(RectangleInsets insets, boolean notify) {
        if (insets == null) {
            throw new IllegalArgumentException("Null 'insets' argument.");
        }
        if (!insets.equals(this.labelInsets)) {
            this.labelInsets = insets;
            if (notify) {
                notifyListeners(new AxisChangeEvent(this));