public final ObjectProperty<Paint> tickMarkFillProperty() {
        if (null == tickMarkFill) {
            tickMarkFill = new StyleableObjectProperty<Paint>(Color.BLACK) {

                @Override public CssMetaData getCssMetaData() { return StyleableProperties.TICK_MARK_FILL; }

                @Override public Object getBean() { return RadialBargraph.this; }

                @Override public String getName() { return "tickMarkFill"; }
            };
        }
        return tickMarkFill;
    }