How to addChild() to Stage From a Packaged Class?

I have a public class as a package.

Upon creating a new class object, the constructor attempts to add a sprite to the stage. I receive the error:
“1180: Call to a possibly undefined method addChild.”

The code snippit reads as such:

private var sprite:Sprite = new Sprite();
private var dot:Shape;
public function Scope(initialName:String = “”, initialSpriteX:Number = 0, initialSpriteY:Number = 100):void {
name = initialName;
sprite.x = initialSpriteX;
sprite.y = initialSpriteY;
addChild(sprite);
dot = new Shape();
sprite.addChild(dot);
}

My guess is that now that the coding is in a package, addChild() needs to be preceded with something such as flash.display.Stage.addChild(); however I do not know what.

Commenting out addChild() causes my code to compile fine, however I’m just seeing a blank screen instead of an oscilloscope (there is far more code to get the scope to cycle, but is irrelevant to this post).