public BooleanProperty innerShadowEnabledProperty() {
        if (null == innerShadowEnabled) {
            innerShadowEnabled = new BooleanPropertyBase(_innerShadowEnabled) {
                @Override protected void invalidated() { fireTileEvent(REDRAW_EVENT); }
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "innerShadowEnabled"; }
            };
        }
        return innerShadowEnabled;
    }
Defines if an inner shadow should be drawn on the tile
background.

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