public void removeOnContentSizeChanged(final BoundsEventListener LISTENER) {
        if (boundsListeners.contains(LISTENER)) { boundsListeners.remove(LISTENER); }
    }
Calling this method will stop all threads. This is needed when using
JavaFX on mobile devices when the device goes to sleep mode.
src/main/java/eu/hansolo/tilesfx/Tile.java