public void setFlatUI(final boolean FLATUI) {
        if (null == flatUI) {
            _flatUI = FLATUI;
            fireTileEvent(REDRAW_EVENT);
        } else {
            if (!flatUI.isBound()) {
                flatUI.set(FLATUI);
            }
        }
    }
Defines if the UI should be more flat than skeuomorphic. At the moment only
used in the LedTileSkin
@param FLATUI
src/main/java/eu/hansolo/tilesfx/Tile.java