[AccessD] Openargs Mystery

Dear List:
 
I call a form which is bound to a table with a list of companies.  The
called form is where the data for the company is entered/edited.  So I pass
the autonumberID, the PK of the company to the called form, do a FindFirst,
and walla! company is displayed.  I use this technique a lot. 
 
So the calling statement is:
 
      DoCmd.OpenForm "frmAssociations", , , , , , Me.fldSRAssociationID

I put a breakpoint here and hover over Me.fldSRAssociationID and sure enough
the value  10005 is in Me.fldSRAssociationID.
 
Press F8 and the _Open event of the called form executes:
 
Private Sub Form_Open(Cancel As Integer)

    Call adhScaleForm(Me, 1600, 800, 96, 96, rctOriginal)
    
    If Not IsNull(Me.OpenArgs) Then
        Me.RecordsetClone.FindFirst "fldAssociationID = " & Val(Me.OpenArgs)
        Me.Bookmark = Me.RecordsetClone.Bookmark
    End If
 
End Sub

At the point where the first line of code is ready to execute (I'm in break
mode now so the execution stops on every line) I hover over Me.OpenArgs and
it shows Me.OpenArgs = Null.
 
Where's my OpenArg?  Why does it disappear.  I never saw this behavior
before.  Any ideas?
 
This is A2003 BTW.
 
MTIA
 
Rocky