ScrollPane width and height

programming flash
1

Hi, im having problems with the scrollpane width and height not being reflected in its parent DisplayObjectContainer.

Example:

 
package{
import fl.containers.ScrollPane;
import flash.display.*;
 public class ScrollPaneDimensionsTest extends Sprite{
 
  public function ScrollPaneDimensionsTest(){
   var sp:ScrollPane = new ScrollPane();
   sp.setSize(200, 200);
 
   var sprite:Sprite = new Sprite();
   sprite.addChild(sp);
 
   trace(sp.width); //prints 200
   trace(sp.height);    //prints 200
   trace(sprite.width); //prints 115!?!?!?!
   trace(sprite.height); //prints 115!?!?!?!
  }
 
 }
}

Any ideas why this is printing 115 instead of 200?