adding a sprite to 1 <s:State>

Question

I'm looking for a flex 4 compatible way of adding a sprite generated with graphics library to a skin.

If I generate the sprite like this:

private function drawShape():void {
   theshape = new Sprite();
   theshape.graphics.beginFill(0x666666);
   theshape.graphics.drawCircle(3,5,10);
   theshape.graphics.endFill();
}

What would be the best way to add it such that I can control its presence by state