public ObjectProperty<Color> highlightColorProperty() {
        if (null == highlightColor) { highlightColor = new SimpleObjectProperty<>(TimeSection.this, "highlightColor", _highlightColor); }
        return highlightColor;
    }
Defines the color that will be used to colorize a highlighted section
@param COLOR
src/main/java/eu/hansolo/tilesfx/TimeSection.java