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

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