[]创建laya的视图销毁destroy()清除不了

class Mail2View extends laya.display.Sprite {

    private display:ui.mail.mail2UI;



    constructor(){

        super();

            this.display = new ui.mail.mail2UI();

			this.addChild(this.display);

    }



    public destroy():void

    {

        this.display.destroy();

        this.display.removeSelf();

        super.destroy();

    }

}