[]如何用代码控制panel的vscroll滚动幅度

package

{

	import laya.display.Sprite;

	import laya.net.Loader;

	import laya.ui.Panel;

	import laya.utils.Handler;



	public class LayaAirDemo

	{

		public function LayaAirDemo()

		{

			Laya.init(600,600);

			Laya.stage.bgColor='#EEFFCC';

			Laya.loader.load("res/atlas/comp.json",Handler.create(this,onLoaded),null,Loader.ATLAS);

		}

		

		private function onLoaded():void

		{

			//panel 切记设置宽高，否则panel不显示

			var panel:Panel=new Panel();

			panel.size(300,300);

			panel.pos(100,100);

			panel.vScrollBarSkin='comp/vscroll.png';

			panel.hScrollBarSkin='comp/hscroll.png';

			Laya.stage.addChild(panel);

			//panel的子对象，，切忌要设置宽高，且宽高大于panel宽高

			var bg:Sprite=new Sprite();

			bg.loadImage("bg2.png",0,0,0,0,Handler.create(this,onLoadedImage,[panel]));

			bg.size(600,800);

			panel.addChild(bg);

		}

		//在子对象加载完成后，设置panel.scrollbar的值以及位置

		private function onLoadedImage(panel:Panel):void

		{

			panel.vScrollBar.min=0;

			panel.vScrollBar.max=100;

			panel.vScrollBar.value=50;

			panel.hScrollBar.min=0;

			panel.hScrollBar.max=100;

			panel.hScrollBar.value=50;

		}

	}

}