public void setBarBackgroundColor(final Color COLOR) {
        if (null == barBackgroundColor) {
            _barBackgroundColor = COLOR;
            fireTileEvent(REDRAW_EVENT);
        } else {
            if (!barBackgroundColor.isBound()) {
                barBackgroundColor.set(COLOR);
            }
        }
    }
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