Web部件页脚不显示

Web部件页脚不显示在这样的Web部件中

<asp:WebPartZone ID="WebPartZone1" runat="server" style="height:100px;" CssClass="PartZone" PartChromeType="TitleAndBorder" ShowTitleIcons="true" Width="200"> 
            <FooterStyle CssClass="PartFooterStyle" />
            <PartTitleStyle CssClass="PartTitleStyle" />

        <ZoneTemplate>

        <asp:Panel ID="Panel2" runat="server" Width="200" Height="200">
        <asp:Button ID="Button1" runat="server" Text="Button"    />

            </asp:Panel>



        </ZoneTemplate>
        </asp:WebPartZone>

这是怎么回事?

谢谢