There are many options like this from ~ Senocular ~. The I came across this at ~ Mr. Doob ~ So clean and simple. I really like it, although it duplicates objects/swf's from outside your file, for me not a problem. You just have to keep your assets in good order. He has some great lab works to play with as well.
If you search there are many ways round it, seems a shame to lose such a useful tool, but I guess its out shone by everything else that AS3 has to offer.