Hi Gary,
In an Access ADP you cannot pass a reference to the form,
because the process is done on SQL Server. You can
however set the row source programmatically in a form's
class module in this fashion

Private Sub SetListSource()
Dim lngParam as long
Dim strProc as string

lngParam=Forms!frmWatchlist!lstWLCriteria
strProc="EXEC WL_Nxt_stp_sfrm_sp " & lngParam

me.lstYourListBox.RowSource=strProc
me.lstYourListBox.requery
End Sub

This should do what you need it to. You may want to put
this code in the form's On Current event, depending on
what you are doing.
Hope this helps. Let me know if it isn't what you were
looking for.
Thanks

G> Exec WL_Nxt_stp_sfrm_sp @crit_id =
G> Forms!frmWatchlist!lstWLCriteria

change the name of the s.p. parameter from @crit_id to @lstWLCriteria; don't
specify any arguments in controlsource; requery the listbox after field
lstWLCriteria changes.

Vadim
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Vadim Rapp Consulting
SQL, Access, VB Solutions
847-685-9073
www.vadimrapp.com