read repeater bindings through code behind

In ASP.NET 2.0 with C#
I have a repeater bind to XMLdatasource.
I have the following binding:

<asp:Repeater runat="server" ID="RPModels"  DataSourceID="XMLModels" >
    <ItemTemplate>
       <asp:HyperLink ID="HPreview" runat="server" NavigateUrl='<%# XPath("ProdTitle_Url") %>'>  
            <%# XPath("Stores_Num")%> </asp:HyperLink>
       <asp:Button ID="btnComparep" runat="server"  Text="Compare"  Width="100px"        
          OnClick="btnComparep_Click"   />
  </ItemTemplate>
</asp:Repeater>
I want that in the code behind in the function btnComparep_Click
to get into a string the value that I get in  <%# XPath("Stores_Num")%>
How do I get this value in the code behind?
thankyou
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