coolite radio check handler的问题

我有两个radio，点第一个，隐藏一个panel，显示另一个panel，我的代码这样写的，不行，各位帮我看看怎么改？

<ext:Radio ID="RichRadio" runat="server" BoxLabel="Rich" Checked="true" GroupName="ContentTypeGroup">
                                        <Listeners>
                                           
                                            <Check Handler="if(checked){#{URLPanel}.hidden();#{EdiorPanel}.visible();}" />
                                        </Listeners>

                                    </ext:Radio>



<ext:Radio ID="URLRadio" runat="server" BoxLabel="URL" GroupName="ContentTypeGroup">
                                        <Listeners>
                                        
                                            <Check Handler="if(checked){#{URLPanel}.visible();#{EdiorPanel}.hidden();}" />
                                        </Listeners>
                                    </ext:Radio> --------------------编程问答-------------------- <Check Handler="if(checked){#{URLPanel}.visible();#{EdiorPanel}.hidden();}" />
这个是什么， 为什么要放到<Listeners>这个标签中间来

补充：.NET技术 ,  ASP.NET