ScrollRect and how to know the real height

Question

I am having a problem when I try to know the real height of the sprite.
I have a clas:
package
    import flash.display.Sprite;
    import flash.events.TimerEvent;
    import flash.geom.Rectangle;
    import flash.system.Capabilities;
    import flash.utils.Timer;
    [SWF( width='800', height='600', frameRate='30', backgroundColor='#ffddee' )] 
    public class Test1 extends Sprite 
        private var timer:Timer;
        private var sprite:Sprite;
        public function Test1() 
            init(); 
        private function init():void 
            timer = new Timer( 2000, 0 );
            timer.addEventListener( TimerEvent.TIMER, onTimer );
            sprite = new Sprite();
            sprite.graphics.beginFill(0x00ffaa);
            sprite.graphics.drawRect(0,0,200,450);
            sprite.graphics.endFill();
            sprite.scrollRect = new Rectangle(0,0,200,200);
            addChild( sprite );
            show(0);
            timer.start();
            trace("START "+flash.system.Capabilities.version);
        private function show(cur_page:int  ):void
            trace("height = "+sprite.height);
            trace("scrollHeight = "+sprite.scrollRect.height);
            trace("boundsHeight = "+sprite.getBounds(sprite).height);
        private function onTimer( e:TimerEvent ):void
            show(0);
and it displays:
height = 450
scrollHeight = 200
boundsHeight = 450
START WIN 10,1,102,64
height = 200
scrollHeight = 200
boundsHeight = 200
Why  sprite.getBounds(sprite).height first time brings the real height, and  then the value by appropriate sprite.scrollRect.height, and how to fix  it?

Answer 1

I found the solution, which was published on 24th February 2009:
http://usecake.com/lab/find-the-height-and-width-of-a-sprite-with-a-scrollrect.html
* This function works like DisplayObject.getBounds(), except it will find the full
* bounds of any display object, even after its scrollRect has been set.
* @param displayObject - a display object that may have a scrollRect applied
* @return a rectangle describing the dimensions of the unmasked content
public function getFullBounds ( displayObject:DisplayObject ) :Rectangle
     var bounds:Rectangle, transform:Transform,
                         toGlobalMatrix:Matrix, currentMatrix:Matrix;
     transform = displayObject.transform;
     currentMatrix = transform.matrix;
     toGlobalMatrix = transform.concatenatedMatrix;
     toGlobalMatrix.invert();
     transform.matrix = toGlobalMatrix;
     bounds = transform.pixelBounds.clone();
     transform.matrix = currentMatrix;
     return bounds;
I  just want to make a sprite that can be scrolled using the scrollRect, for  this I need to know the scrollRect.height and full height of the sprite
The  solution I've found works, but I would like to know how to get the full  height of the sprite that has a scrollRect, using the native language  facilities.
Is this a bug, or am I doing something wrong?