按照示例程序写了个list，出现两个问题：
1. list不能滚动
2. list item里的button图片显示不出来

item代码如下：

(function (_super){
    function MarketItem()
    {
        MarketItem.__super.call(this);

        this.size(312, 462);

        // {id:1,name:"10金豆-测试",price:0.01,title:"10金豆-测试",desc:"测试",balance:10,gift:0,imgPath:"res\\common\\BalanceSellDlg\\xiaodou.png",hot:1,orderCount:9}

        // 背景
        var bg_image = new Laya.Image();
        bg_image.skin = "res/popupwnd/market_item_bg.png";
        bg_image.pos(0, 0);
        bg_image.size(312, 462);
        this.addChild(bg_image);

        // 金豆数
        this._goldLabel = new Laya.Label();
        this._goldLabel.color = "#FFBA00";
        var font = GameUI.GetFont("$font.marketdlg.default");
        this._goldLabel.font = font.family;
        this._goldLabel.bold = (parseInt(font.bold | 0) == 0 ? false : true);
        this._goldLabel.fontSize = parseInt(font.size);
        this._goldLabel.underline = (parseInt(font.underline | 0) == 0 ? false : true);
        this._goldLabel.align = "center";
        this._goldLabel.valign = "middle";
        this._goldLabel.pos(0, 50);
        this._goldLabel.size(312, 20);
        this.addChild(this._goldLabel);

        // 金豆图片
        this._goldImage = new Laya.Image();
        this.addChild(this._goldImage);

        // 购买按钮
        this._goldButton = new Laya.Button();
        this._goldButton.skin = "res/popupwnd/btn_buygold.png";
        this._goldButton.labelFont = font.family;
        this._goldButton.labelBold = (parseInt(font.bold | 0) == 0 ? false : true);
        this._goldButton.labelSize = parseInt(font.size);
        this._goldButton.labelColors = "#FFFFFF,#FFFFFF,#FFFFFF,#EEEEEE";
        this._goldButton.stateNum = 1;
        this._goldButton.pos(75, 350);
        this.addChild(this._goldButton);

        this.setGold = function(gold)
        {
            this._goldLabel.text = "×" + gold + "金豆";
        };

        this.setGoldImage = function(img)
        {
            this._goldImage.skin = img;
            this._goldImage.pos((312-this._goldImage.width)/2, (462-this._goldImage.height)/2);
        };

        this.setPrice = function(price)
        {
            this._goldButton.label = "RMB " + price;
        };
    }
    Laya.class(MarketItem, "xgame.marketitem", _super);

})(Laya.Box);

list代码如下：

var list = new Laya.List();
list.itemRender = xgame.marketitem;
list.repeatX = 3;
list.repeatY = 1;
list.spaceX = 10;
list.hScrollBarSkin = "";
//list.vScrollBarSkin = "";
list.pos((BalanceMarketDlg.width-312*3-10*2)/2, 120);
list.selectEnable = true;
list.renderHandler = new Laya.Handler(this, UpdateMarketItem);
Laya.stage.addChild(list);
list.array = that._items;[/code]updateitem代码如下：

[code]function UpdateMarketItem(cell, index)
{
    // {id:1,name:"10金豆-测试",price:0.01,title:"10金豆-测试",desc:"测试",balance:10,gift:0,imgPath:"res\\common\\BalanceSellDlg\\xiaodou.png",hot:1,orderCount:9}
    cell.setGold(cell.dataSource.balance + cell.dataSource.gift);
    cell.setGoldImage(cell.dataSource.imgPath);
    cell.setPrice(cell.dataSource.price);

}