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flex How to create fixed size swf in pure AS3 only?

Your Application is sort of like a Canvas inside of the flash player. Thus, you can give it a fixed size (with the width and height attributes), but that will just reduce its size inside the flash player. I don't think you can mess with this in pure AS3 - you'd need to change the underlying HTML (although, you may be able to do this with ExternalInterface, which allows you to call javascript methods on the HTML page...).