EnterframeInvalidation.as

protected var shape:Shape = new Shape();

public function invalidate():void
{
	shape.addEventListener(Event.ENTERFRAME, invalidateHandler);
}

protected function invalidateHandler(event:Event):void
{
	stage.removeEventListener(Event.ENTERFRAME, invalidateHandler);

	validate();
}

StageInvalidation.as

public function invalidate():void
{
	stage.addEventListener(Event.RENDER, invalidateHandler);
	stage.addEventListener(Event.ENTERFRAME, invalidateHandler);

	stage.invalidate();
}

protected function invalidateHandler(event:Event):void
{
	stage.removeEventListener(Event.RENDER, invalidateHandler);
	stage.removeEventListener(Event.ENTERFRAME, invalidateHandler);

	validate();
}

TimerInvalidation.as

protected var timer:Timer = new Timer(0.0, 1);

public function TimerInvalidation()
{
	timer.addEventListener(TimerEvent.TIMER_COMPLETE, invalidateHandler);
}

public function invalidate():void
{
	timer.reset();
	timer.start();
}

protected function invalidateHandler(event:TimerEvent):void
{
	validate();
}