public ObjectProperty<Color> barColorProperty() {
        if (null == barColor) {
            barColor  = new ObjectPropertyBase<Color>(_barColor) {
                @Override protected void invalidated() { fireTileEvent(REDRAW_EVENT); }
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "barColor"; }
            };
            _barColor = null;
        }
        return barColor;
    }
Defines the color that will be used to colorize the bar of
the tile (if it has a bar).

@param COLOR
src/main/java/eu/hansolo/tilesfx/Tile.java