This will cause the 3d sprite to completely fill the browser. On resize, all 2d interface overlay will need to reposition themselves so that they remain anchored to the corners or sides of the scene.
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Shockwave settings.
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fcSprite_StretchToStage behavior
Live example: http://forgefx.com/posts/stagestretch/StageStretch.htm
Example dir: http://forgefx.com/posts/stagestretch/StageStretch.zip