谁用过ExtAspNet帮我看看是怎么回事啊？

Question

如果加载的内容过多 按钮就会失效 点击没反应 如果我把按钮选中后在点击 就能起效 是怎么回事啊？
跪求各位大虾帮帮忙！前台代码
 <ext:PageManager ID="PageManager1" runat="server" />
            <ext:SimpleForm ID="SimpleForm1" ShowBorder="false" ShowHeader="false" runat="server"
                BodyPadding="5px" EnableBackgroundColor="true" Title="SimpleForm">
                <Toolbars>
                    <ext:Toolbar ID="Toolbar1" runat="server">
                        <Items>
                            <ext:Button ID="btnNew" runat="server" EnablePostBack="false" Text="修改" ConfirmTarget="Top" DisableControlBeforePostBack="false" EnableAjax="false">
                            </ext:Button>
                        </Items>
                    </ext:Toolbar>
                </Toolbars>
                <Items>
                    <ext:Form ID="formGs" runat="server" ShowBorder="True" EnableBackgroundColor="true"
                        ShowHeader="false">
                        <Rows>
                            <ext:FormRow>
                                <Items>
                                    <ext:Label ID="labPubTitle" runat="server" Label="公司名称" Text="">
                                    </ext:Label>
                                </Items>
                            </ext:FormRow>
                            <ext:FormRow>
                                <Items>
                                    <ext:ContentPanel ID="ContentPanel2" runat="server" BodyPadding="5px" EnableBackgroundColor="true"
                                        ShowBorder="false" ShowHeader="false" Title="简介">
                                        <asp:Label ID="Label1" runat="server" Text="简介"></asp:Label>
                                        <div runat="server" id="divPubComment"></div>
                                    </ext:ContentPanel>
                                </Items>
                            </ext:FormRow>
                            <ext:FormRow>
                                <Items>
                                    <ext:Label ID="labPubCreateTime" runat="server" Label="创建时间" Text="">
                                    </ext:Label>
                                </Items>
                            </ext:FormRow>
                            <ext:FormRow>
                                <Items>
                                    <ext:Label ID="labPubCreateUser" runat="server" Label="创建者" Text="">
                                    </ext:Label>
                                </Items>
                            </ext:FormRow>
                        </Rows>
                    </ext:Form>
                </Items>
            </ext:SimpleForm>
            <ext:Window ID="Window1" runat="server" Height="580px" IsModal="true" Popup="false"
            Target="Parent" EnableIFrame="true" IFrameUrl="about:blank" Width="700px" OnClose="Window1_Close">
        </ext:Window>
        </div>
后台代码
protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            LoadBotton();
        }
    }
    #region 加载按钮
    /// <summary>
    /// 加载按钮
    /// </summary>
    public void LoadBotton()
    {
        BLL.PublicInfoManage bll = new BLL.PublicInfoManage();
        List<Model.PublicInfo> list = bll.GetModelList("PubType='公司简介'");
        if(list.Count > 0)
        {
            btnNew.OnClientClick = Window1.GetShowReference("edit_gsjj.aspx?id=" + int.Parse(list[0].Id.ToString()), "新增");
            LoadBind();
        }
        else
        {
            btnNew.OnClientClick = Window1.GetShowReference("edit_gsjj.aspx", "新增");
            LoadBind();
        }
    }
    #endregion