Stage (capital S) is the Class's name.
stageHeight is Stage's property (-not- a static one). So it
should be accessed not through the class Stage. It should be
accessed through someDisplayObj.stage:
"The Stage object is not globally accessible. You need to
access it through the stage property of a DisplayObject instance."
Stage.stageWidth = 800; ==> Doesn't even compile... :(
stage.stageWidth = 800; ==> Should work, since it's
written inside a class that extends sprite (which is a