为什么UpdatePanel中的按钮在第一次之后没有执行JQuery事件?

我有一个按钮(在UpdatePanel内)打开一个弹出式表单，允许我输入一些数据，然后提交一些功能(更新UpdatePanel与输入的新数据)并关闭弹出:

<asp:HyperLink ID="hlCreateMsg" runat="server" NavigateUrl="JavaScript:void(0);" CssClass="linkOff" ClientIDMode="Static">Create New</asp:HyperLink>
<div id="popupContact">
    <a id="popupContactClose" title="Close Window">x</a>
    <h3>Add a New Message</h3>
    <div id="dvFirst" class="mainSecond">
        <div id="leftdiv3" class="leftdiv">Client: </div>
        <div id="rightdiv3" class="rightdiv"><asp:DropDownList ID="ddlCliNewMsg" AutoPostBack="false" ClientIDMode="Static" runat="server" CssClass="chosen-select" ></asp:DropDownList></div>
    </div>
    <div id="dvSecond" class="mainSecond">
        <div id="leftdiv4" class="leftdiv">Site: </div>
        <div id="rightdiv4" class="rightdiv"><asp:DropDownList ID="ddlSitNewMsg" AutoPostBack="false" ClientIDMode="Static" runat="server" CssClass="chosen-select"></asp:DropDownList></div>
    </div>
   <div id="dvThird" class="mainSecond">
        <div id="leftdiv5" class="leftdiv">Provider: </div>
        <div id="rightdiv5" class="rightdiv"><asp:DropDownList ID="ddlProNewMsg" AutoPostBack="false" ClientIDMode="Static" runat="server" CssClass="chosen-select"></asp:DropDownList></div>
    </div>
    <div id="dvFourth" class="mainFirst">
        <div id="leftdiv1" class="leftdivspec"><sup style="color: #FF0000; font-weight: bold;">*</sup>Message: </div>
        <div id="rightdiv1" class="rightdivspec"><asp:TextBox ID="tbMessage" ClientIDMode="Static" runat="server" TextMode="MultiLine" Columns="30" Rows="5"></asp:TextBox></div>
    </div>
    <div id="dvFifth" class="mainSecond">
        <div id="leftdiv2" class="leftdiv">Active?</div>
        <div id="rightdiv2" class="rightdiv"><asp:CheckBox ID="cbIsActive" ClientIDMode="Static" runat="server" /></div>
    </div>
    <div style="width: 96%; text-align: right; padding: 2%;">
        <asp:UpdatePanel runat="server" ID="upSubmit" ClientIDMode="Static" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Button ID="btnSubmit" runat="server" Text="Submit" CssClass="btnExport" ClientIDMode="Static" UseSubmitBehavior="false" OnClick="SubmitAdminMessage" />
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
</div>
<div id="backgroundPopup"></div>

脚本:

//CONTROLLING EVENTS IN jQuery
$(document).ready(function () {
    //LOADING POPUP
    //Click the button event!
    $("#hlCreateMsg").click(function (e) {
        e.preventDefault();
        //centering with css
        centerPopup();
        //load popup
        loadPopup();
    });
    $("#Create").click(function (e) {
        e.preventDefault();
        //centering with css
        centerPopup();
        //load popup
        loadPopup();
    });
    $("#btnSubmit").on('click', function (e) {
        alert('test');
        e.preventDefault();
        disablePopup();
    });
    //CLOSING POPUP
    //Click the x event!
    $("#popupContactClose").click(function () {
        disablePopup();
    });
    //Click out event!
    $("#backgroundPopup").click(function () {
        disablePopup();
    });
    //Press Escape event!
    $(document).keypress(function (e) {
        if (e.keyCode == 27 && popupStatus == 1) {
            disablePopup();
        }
    });
});

//SETTING UP OUR POPUP
//0 means disabled; 1 means enabled;
var popupStatus = 0;
//loading popup with jQuery magic!
function loadPopup() {
    //loads popup only if it is disabled
    if (popupStatus == 0) {
        $("#backgroundPopup").css({
            "opacity": "0.7"
        });
        $("#backgroundPopup").fadeIn("slow");
        $("#popupContact").fadeIn("slow");
        popupStatus = 1;
    }
}
//disabling popup with jQuery magic!
function disablePopup() {
    //disables popup only if it is enabled
    if (popupStatus == 1) {
        $("#backgroundPopup").fadeOut("slow");
        $("#popupContact").fadeOut("slow");
        $("#tbMessage").val('');
        $("#cbIsActive").attr("checked", false);
        popupStatus = 0;
    }
}
//centering popup
function centerPopup() {
    //request data for centering
    var windowWidth = document.documentElement.clientWidth;
    var windowHeight = document.documentElement.clientHeight;
    var popupHeight = $("#popupContact").height();
    var popupWidth = $("#popupContact").width();
    //centering
    $("#popupContact").css({
        "position": "absolute",
        "top": windowHeight / 2 - popupHeight / 2,
        "left": windowWidth / 2 - popupWidth / 2
    });
    //only need force for IE6
    $("#backgroundPopup").css({
        "height": windowHeight
    });
}

所以第一次页面加载，我点击hlCreateMsg链接，弹出窗口出现，我可以输入数据并提交。弹出窗口关闭并更新UpdatePanel，同时显示test警报窗口。但每次我打开弹出窗口(不刷新页面)，提交按钮确实更新了UpdatePanel，但它不关闭弹出窗口，也不显示test警报。

如何解决这个问题?

更新:在查看了一些其他问题后，通过修改代码来解决:

$("#btnSubmit").live('click', function (e) {
        e.preventDefault();
        disablePopup();
    });

但这给了我一个错误:0x800a01b6 - Microsoft JScript runtime error: Object doesn't support this property or method