public void setNeedleColor(final Color COLOR) {
        if (null == needleColor) {
            _needleColor = COLOR;
            fireTileEvent(REDRAW_EVENT);
        } else {
            if (!needleColor.isBound()) {
                needleColor.set(COLOR);
            }
        }
    }
Defines the color that will be used to colorize the needle of
the radial tiles.

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