Screenshot to photo library?

This will do the trick

if (CameraRoll.supportsAddBitmapData)   

{

        var cameraroll:CameraRoll = new CameraRoll(); 

        cameraroll.addEventListener(ErrorEvent.ERROR, handle_error); 

        cameraroll.addEventListener(Event.COMPLETE, handle_complete); 

        var bitmap_data:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight); 

       bitmap_data.draw(stage);

       cameraroll.addBitmapData(bitmap_data); 

}

else { trace("CameraRoll isn't supported."; }