public void setValueColor(final Color COLOR) {
        if (null == valueColor) {
            _valueColor = COLOR;
            fireTileEvent(REDRAW_EVENT);
        } else {
            if (!valueColor.isBound()) {
                valueColor.set(COLOR);
            }
        }
    }
Defines the color that will be used to colorize the value
of the tile.

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