[LayaAir 1.0]DialogManager怎么添加遮罩层

	var dialogManager =new DialogManager();

			var sprite1=new Laya.Sprite();

			sprite1.loadImage("scdlb/首充大礼包通用素材/通用素材/背景黑色蒙版.png",0,0,1600,1080);

			this.scTipsPg= new ScTpisUI();

			console.log(this.scTipsPg.manager);

			this.scTipsPg.manager=dialogManager;

			this.scTipsPg.manager.maskLayer=sprite1;

			this.scTipsPg.popupCenter=false;

			this.scTipsPg.top=60;

			this.scTipsPg.right=-510;

			this.scTipsPg.show();

不知道哪里写错了？用过人的帮忙看下~~