public static function unsubscribeAllButtonOnClick(items:Array<ContainerNode>, touchEventAction:Action2<ContainerNode, Event>) {
        if(touchEventAction == null) {
            throw new ArgumentNullException("Parameter 'touchEventAction' can't be null");
        }
        for(item in items) {
            var button:ButtonNode = cast(item, ButtonNode);
            button.eventOccured -= touchEventAction;
        }
    }