public void setReferenceValue(final double VALUE) {
        if (null == referenceValue) {
            _referenceValue = VALUE;
            fireTileEvent(REDRAW_EVENT);
        } else {
            if (!referenceValue.isBound()) {
                referenceValue.set(VALUE);
            }
        }
    }
Defines the reference value that will be used in the HighLowTileSkin
@param VALUE
src/main/java/eu/hansolo/tilesfx/Tile.java