public void setOnContentSizeChanged(final BoundsEventListener LISTENER) {
        if (null == getSkin()) {
            if (!boundsListeners.contains(LISTENER)) { boundsListeners.add(LISTENER); }
        } else {
            ((TileSkin) (getSkin())).setOnContentBoundsChanged(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