public void fireTileEvent(final TileEvent EVENT) {
        if (null != showing && showing.get()) {
            for (TileEventListener listener : tileEventListeners) { listener.onTileEvent(EVENT); }
        } else {
            tileEventQueue.add(EVENT);
        }
    }
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