ASP.NET中用JS弹出模态对话框后在里面的分页的问题!

下面是我打开模态对话框的JS函数:
<script language="javascript">
                function OpenWin(){
                var str=window.showModalDialog('selorder.aspx','','dialogLeft=80px;dialogTop=80px;dialogWidth=650px;dialogHeight=450px');
                if(str!=null)  
                    document.getElementById("ctl00_ContentPlaceHolder1_txtPayMoney").value = str;
                }
</script>


下面是selorder.aspx页面的主要代码:
<asp:GridView ID="gdvOrders" runat="server" AutoGenerateColumns="False" 
                CssClass="mconttable" PageSize="5">
        ...
            </asp:GridView>
            <br />
            <webdiyer:AspNetPager PageSize="5" ID="anpOrderByLocId" runat="server" FirstPageText='首'
            LastPageText='尾' CssClass="pageindexlink" CurrentPageButtonClass="aaa" CustomInfoClass=""
            PagingButtonSpacing="" OnPageChanged="anpOrderByLocId_PageChanged">
        </webdiyer:AspNetPager>
            <br />
<input type='button' name='bb' id='bb' style="width:80px" value='选择' runat="server" />


下面是selorder.aspx.cs页面的主要代码:
   protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            // 通过登陆的用户名获取公司ID
            DataTable dt = OrderDAO.SearchLocByUserName(Profile.UserName);
            int locid = int.Parse(dt.Rows[0]["Id"].ToString());  // 公司ID
            ViewState["locid"] = locid;

            anpOrderByLocId.RecordCount = OrderDAO.QueryOrderCount("CoLocId=" + locid);

            BindDataOrderByLocId(locid);

            bb.Attributes.Add("onclick", "window.parent.returnValue=76.78;window.close();");
        }
    }

    // 绑定订单数据,用于默认查询
    private void BindDataOrderByLocId(int locid)
    {
        int startIndex = anpOrderByLocId.StartRecordIndex;
        int endIndex = anpOrderByLocId.EndRecordIndex;

        gdvOrders.DataSource = OrderDAO.QueryOrderByLocId(locid, startIndex, endIndex);
        gdvOrders.DataBind();
    }


    // 默认查询换页
    protected void anpOrderByLocId_PageChanged(object sender, EventArgs e)
    {
        BindDataOrderByLocId(int.Parse(ViewState["locid"].ToString()));
    }


 可是我在弹出的模态对话框内点击换页的按键的时候就换不了页,不知道怎么回事,但是单独运行selorder.aspx是可以分页的.

  解决方法:
   得在selorder.aspx的head部分加入些代码,下面是head的代码:
<head runat="server">
    <title>选择订单</title>
    <!-- 防止重新打开页面形式的对话框 -->
    <base target="_self" /> 
</head>

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