I've cut and pasted and fixed lots of code from a vs2003 app to vs2005. One problem remains:

In my test.ascx web form I call a function. For example: 

<asp:repeater id="rptLetterSearch" runat="server">
   <ItemTemplate>
      <asp:HyperLink ID="HyperLink1" runat="server" 
      NavigateUrl="<%# FilterURL(Container.DataItem) %>" 
      Text="<%# Container.DataItem %>" >
      </asp:HyperLink>
   </ItemTemplate>
</asp:repeater>

test.ascx.vb has the function:

 Protected Function FilterURL(ByVal Filter As String) As String
         Return NavigateURL(TabId) & URLConnect() & "txtFind=" & Filter
End Function

The code compiles and runs fine.
Yet vs2005 gives me an error on the test.ascx file:   Name 'FilterURL' is not declared

Ideas?