Asp.net Ajax 服务器控件使用--7.DropDown

最简单的实现
<asp:Label ID="TextLabel" runat="server" Text="Hover Over Me" Font-Names="Tahoma"
            Font-Size="11px" Style="display: block; width: 300px; padding: 2px; padding-right: 50px;" />
        <asp:Panel ID="DropPanel" runat="server" CssClass="ContextMenuPanel" Style="display: none;
            visibility: hidden;">
            <asp:LinkButton runat="server" ID="Option1" Text="百度" CssClass="ContextMenuItem"
                PostBackUrl ="http://www.baidu.com/" />
            <asp:LinkButton runat="server" ID="Option2" Text="新浪" CssClass="ContextMenuItem"
               PostBackUrl ="http://www.sina.com/" />
            <asp:LinkButton runat="server" ID="Option3" Text="163" CssClass="ContextMenuItem"
              PostBackUrl ="http://www.163.com/" />
        </asp:Panel>
        <cc1:DropDownExtender runat="server" ID="DDE" TargetControlID="TextLabel"
            DropDownControlID="DropPanel" /