public ObjectProperty<Color> needleColorProperty() {
        if (null == needleColor) {
            needleColor  = new ObjectPropertyBase<Color>(_needleColor) {
                @Override protected void invalidated() { fireTileEvent(REDRAW_EVENT); }
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "needleColor"; }
            };
            _needleColor = null;
        }
        return needleColor;
    }
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