Action Script Sprite unusual behaviour

[A]

Hi Guys,

do you see any issue with this program, i get a blank screen when i
execute this .
not sure what is wrong in it .


package {
import flash.display.Sprite;
import flash.geom.Matrix;
import flash.display.Loader;
import flash.net.URLRequest;
import flash.display.BitmapData;
import flash.events.Event;
public class Drawing extends Sprite {
private var _loader:Loader;
public function Drawing( ) {
_loader = new Loader( );
_loader.load(new URLRequest("http://www.rightactionscript.com/
samplefiles/image2.jpg"));
_loader.contentLoaderInfo.addEventListener(Event.COMPLETE,
onImageLoad);
}
private function onImageLoad(event:Event):void {
var bitmap:BitmapData = new BitmapData(_loader.width,
_loader.height);
bitmap.draw(_loader, new Matrix( ));
var matrix:Matrix = new Matrix( );
matrix.scale(.1, .1);
var sampleSprite:Sprite = new Sprite( );
sampleSprite.graphics.lineStyle( );
sampleSprite.graphics.beginBitmapFill(bitmap, matrix);
sampleSprite.graphics.drawCircle(100, 100, 100);
sampleSprite.graphics.endFill( );
addChild(sampleSprite);
}
}
}

[Veena Chezhian]

try to add one error event listener and see if there is any error . 

 _loader.contentLoaderInfo.addEventListener( IOErrorEvent.IO_ERROR, errorHandler); 

 _loader.contentLoaderInfo.addEventListener( SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler); 

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