repeater嵌套的问题,高手快来救救我

asp:Repeater ID="rParentTag" runat="server" OnItemDataBound="rParentTag_ItemDataBound">
    <HeaderTemplate>
     <table >
    </HeaderTemplate>
    <ItemTemplate>
          <tr>
           <td align="left" valign="top"><%#DataBinder.Eval(Container.DataItem,"aa")%></td>
    <asp:Repeater runat="server" ID="rTagList" DataSource='<%# ((DataRowView)Container.DataItem).CreateChildView("re") %>'  >
    <ItemTemplate>
        日期：<asp:Label ID="lblPostTime" runat="server" text="2006"/></div> </td>
                        </tr>
                      </table>
</ItemTemplate>
    </asp:Repeater>
    </ItemTemplate>
    <FooterTemplate>
         </table>
    </FooterTemplate>
    </asp:Repeater>
大致是这样,现在我要如何才能在rParentTag_ItemDataBound()事件里得到lblPostTime的引用
或者如何才能触发rTagList的ItemDataBound()事件?
我用(Label )e.item.FindControl("lblPostTime")找到的为空