Oh god, I am ashamed, I think I figure it out now.

First, when I say "I found in different run-time, movieclips dispatchFRAME_CONSTRUCTED event differently",  this is because bug in my own code, event handler is fired, but before I trace() any information, it returns because some logic error. so I thought the event is not dispatched, I was wrong.

So now I need to do some demos to find out how movieclips dipatch FRAME_CONSTRUCTED(with those movieclips with one single frame, and in different version of flash players).

But I still what to know the answer to my second quesion " is there any way that I can know if a movieclip is already "FRAME_CONSTRUCTED" so I don't need to add event listener(such as, mc.isConstructed?)". It will be very helpful if there's any way.

And here I want to ask another quesion, it's a quesion related to the topic, but it's a different one. My quesion is : when I caching movieclips to bitmapData, I find somehow sometimes, the return of method MovieClip.getBounds() is not right EVEN I call it after or when the movieclip dispatches FRAME_CONSTRUCTED event. So what I got is a animation that is "trambling" because I got wrong position of some of the frames of that movieclip(I put bitmapData I cached onto Bitmaps, and set it's position according to what MovieClips.getBounds() tells me).

So any information or suggestion? Thank you.

Thank you very very much, kglad,

I,m applying your method to my application,

I wonder if I have a lot of movieclip objects in my application which need to be cached, I think I need to call stage.invalidate() each time when I try to cache one of them, because I don't know/can't control the order in which those movieclip appears(most of displayobjects in my application is cached, so caching may happen when UI is loaded, animation is displayed. etc, yes I do it dynamicly).

1.So my quesion is, is there any affect to run-time performance if I call stage.invalidate() a lot?

2.If answer is true, when should I call stage.invalidate() so that all display object in the very frame can fire Event.RENDER( I read Event.RENDER api doc, I guess I only need to call it once, then all display object in the render list can dispatch Event.RENDER when it has next chance to render, am I right? and when is it not too late for me to call stage.invalidate() if I don't want to miss any display object?).

Thank you!