TabContainer控件里面放不了Accordion

不知大家有没遇到了这个问题？
C# code

 <cc1:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0">
        <cc1:TabPanel ID="PerInfor" runat="server" HeaderText="TabPanel1">
            <HeaderTemplate>
                个人资料
            </HeaderTemplate>
            <ContentTemplate>
              

        
            <cc1:Accordion ID="Accordion2" runat="server" SelectedIndex="0" FadeTransitions="true" FramesPerSecond="40" TransitionDuration ="250" AutoSize="Limit"  Height ="300px" Width ="400" HeaderCssClass ="accordinHeader"  ContentCssClass ="accordionContent">
                <Panes>
                    <cc1:AccordionPane ID="AccordionPane1" runat="server">
                        <Header>头部</Header>
                        <Content>内容</Content>
                    </cc1:AccordionPane>
                </Panes>
            </cc1:Accordion> 

 
            </ContentTemplate>
           </cc1:TabContainer>
    

这样子嵌套不行出错！
求高手！

但是拉到外面就可以的！
C# code

<cc1:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0">
        <cc1:TabPanel ID="PerInfor" runat="server" HeaderText="TabPanel1">
            <HeaderTemplate>
                个人资料
            </HeaderTemplate>
            <ContentTemplate>
              
            </ContentTemplate>
           </cc1:TabContainer>


 <cc1:Accordion ID="Accordion2" runat="server" SelectedIndex="0" FadeTransitions="true" FramesPerSecond="40" TransitionDuration ="250" AutoSize="Limit"  Height ="300px" Width ="400" HeaderCssClass ="accordinHeader"  ContentCssClass ="accordionContent">
                <Panes>
                    <cc1:AccordionPane ID="AccordionPane1" runat="server">
                        <Header>头部</Header>
                        <Content>内容</Content>
                    </cc1:AccordionPane>
                </Panes>
            </cc1:Accordion> 

有时会提示是panes出错，、个人觉得应该是TabContainer和Accordion的panes出现冲突了！
求高手出现解决问题！