public BooleanProperty lowerThresholdVisibleProperty() {
        if (null == lowerThresholdVisible) {
            lowerThresholdVisible = new BooleanPropertyBase(_lowerThresholdVisible) {
                @Override protected void invalidated() { fireTileEvent(VISIBILITY_EVENT); }
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "lowerThresholdVisible"; }
            };
        }
        return lowerThresholdVisible;
    }
Defines if the lower threshold indicator should be drawn

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