@Override protected void invalidated() {
                    if (null == get()) set(Locale.US);
                    fireTileEvent(REDRAW_EVENT);
                }
Defines if effects like shadows should be drawn.
In some tiles inner- and dropshadows will be used which will be
switched on/off by setting the shadowsEnabled property.

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