stage.fullScreenWidth/Height not working

[rondog]

I am using the code directly from here: http://livedocs.adobe.com/flash/9.0/...ullScreenWidth

and getting this error:

1119: Access of possibly undefined property fullScreenWidth through a reference with static type flash.display:Stage.
1119: Access of possibly undefined property fullScreenHeight through a reference with static type flash.display:Stage.

Am I missing a package or something???

[cancerinform]

You must have changed stage to Stage. Then you get this error.
stage.fullScreenSourceRect = fullScreenRect;
stage.displayState = StageDisplayState.FULL_SCREEN;