[AccessD] Puzzling query behavior

I have some code used to do Filter By Form. It code from ADH. It makes a
copy of the form in question, adding a QBF suffx to it. You a button on your
orignal form to open the QBF form, which then lets build up a filter
expression and passes it back to your original form.

So far, so good. The problem is that there are a pair of combo boxes on the
original form which let the user move throw the records using the seach
combos.

Here's the problem. Although there is a new filter on the form, these combos
still relect the whole recordset. I have tried various things without
success. It's very puzzling.

<code>
    With Me
        If .Filter <> "" Then
            Dim strSQL1 As String, strSQL2 As String
            strSQL1 = "SELECT * FROM SitesByName_qs WHERE " & .Filter
            strSQL2 = "SELECT * FROM SitesByNumber_qs WHERE " & .Filter
            Debug.Print strSQL1
            Debug.Print strSQL2
            .SiteByName_finder_cbo.RowSource = strSQL1
            Debug.Print "Row source is now: " &
.SiteByName_finder_cbo.RowSource
            .SiteNumber_finder_cbo.RowSource = strSQL2
            Debug.Print "Row source is Now: " &
.SiteNumber_finder_cbo.RowSource
            .SiteByName_finder_cbo.Requery
            .SiteNumber_finder_cbo.Requery
        End If
        .Requery
    End With
-- in the debug I see what I expect, such as
SELECT * FROM SitesByName_qs WHERE (([SiteCity] LIKE "Toronto*"))
SELECT * FROM SitesByNumber_qs WHERE (([SiteCity] LIKE "Toronto*"))
Row source is now: SELECT * FROM SitesByName_qs WHERE (([SiteCity] LIKE
"Toronto*"))
Row source is Now: SELECT * FROM SitesByNumber_qs WHERE (([SiteCity] LIKE
"Toronto*"))
<code>

I'm baffled. I can't see what I'm doing wrong, but I inspect the two combos
rowsource they are back to their original values

Ideas?
Thanks,
Arthur