ASP AJAX TABS Sys.InvalidOperationException错误

Question

大家好，我有一个webform，它在选项卡的内容teplte中使用了ajax标签我把用户控件放在这里是一个例子

 <ajaxtoolkit:tabcontainer id="StyledTabContainer"  runat="server" activetabindex="0"
        width="600px" cssclass="MyTabStyle">

                <!-- Overview Tab -->
                <ajaxToolkit:TabPanel HeaderText="Overview" CssClass="none" runat="server" ID="TabPanel1" OnClientClick="PanelClickHide">
                    <ContentTemplate>
                        <div>
                            <h3>Overview</h3>

                            <p>
                                &nbsp;<over:Overview id="overview"  runat="server" />
                              </p>
                        </div>
                    </ContentTemplate>

                </ajaxToolkit:TabPanel>
                <!-- Pre-test Tab -->
                <ajaxToolkit:TabPanel HeaderText="Pre-test" runat="server" ID="TabPanel2" OnClientClick="PanelClickHide">
                    <ContentTemplate>
                        <h3>Pre-test</h3>
                        <br />
                        <p>
                          <pre:PreTest id="pretest" runat="server" />
                        </p>

                    </ContentTemplate>
                </ajaxToolkit:TabPanel>
                <!-- Webcast -->
                <ajaxToolkit:TabPanel HeaderText="Webcast"  runat="server" ID="TabPanel3" OnClientClick="PanelClick">
                    <ContentTemplate>
                        <h3>Webcast</h3>
                        <br />
                        <p id="pvisible" style="display:none">
                            <vid:Video id="vid1" runat="server"/>
                        </p>
                    </ContentTemplate>
                </ajaxToolkit:TabPanel>
                <!-- Post-test Tab -->
                <ajaxToolkit:TabPanel HeaderText="Post-test" runat="server" ID="TabPanel4" OnClientClick="PanelClickHide">
                    <ContentTemplate>
                        <h3>Post-Test</h3>
                        <br />
                        <p>
                         <post:Post id="post" runat="server" />
                        </p>    
                    </ContentTemplate>
                </ajaxToolkit:TabPanel>
</ajaxtoolkit:tabcontainer> 

在用户控件中我有一个提交按钮。

在ajax标签所在的webform上的

我控制在这里打开或关闭哪个标签是示例

if (status.Part1StartDate != null)
                {
                    StyledTabContainer.ActiveTabIndex = 1;
                    TabPanel1.Enabled = false;
                    TabPanel2.Enabled = true;
                    TabPanel3.Enabled = false;
                    TabPanel4.Enabled = false;
                    TabPanel5.Enabled = false;
                    TabPanel6.Enabled = false;


                }
                if (status.Part1Done == true)
                {
                    StyledTabContainer.ActiveTabIndex = 2;
                    TabPanel1.Enabled = false;
                    TabPanel2.Enabled = false;
                    TabPanel3.Enabled = true;
                    TabPanel4.Enabled = false;
                    TabPanel5.Enabled = false;
                    TabPanel6.Enabled = false;


                }

每当我点击内容模板中的用户控件内的按钮时，我会收到此错误。

    Microsoft JScript runtime error: Sys.InvalidOperationException:
 Handler was not added through the Sys.UI.DomEvent.addHandler method.

请帮助.....

谢谢