public BooleanProperty runningProperty() {
        if (null == running) {
            running = new BooleanPropertyBase(_running) {
                @Override protected void invalidated() {
                    if (get() && !isAnimated()) { scheduleTickTask(); } else { stopTask(periodicTickTask); }
                }
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "running"; }
            }; }
        return running;
    }
Defines if the clock is running.
The clock will only start running if animated == false;
@param RUNNING
src/main/java/eu/hansolo/tilesfx/Tile.java