How to make width/height of stage flexible/auto fit in flash?

In flex the width can be set to 100%,but in flash it seems I can only set the width/height in unit of px.

Is there a way to set the stage to 100% instead of xxx px in flash?

I'm using Flash Profession开发者_JAVA百科al CS5 if that matters.

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This should be what you're looking for:

http://www.adobe.com/devnet/flash/articles/liquid_gui.html