[Excel 2003] Check for Autofill on Worksheet_Change event?

Does anyone know if it's possible to check, on the Worksheet_Change event, if autofill is the reason for the change?

I basically have a change event so that I can monitor if someone enters something in the first column. If the target range is in the first column, I perform a vlookup from a table, and plug in the corresponding value in the second column. (I'm not using vlookup formulas in the cells because it's messy for quite a few reasons).

However, in the case that someone is copying and pasting or auto-filling into both the first and second column, I was getting some wierd results. I have the copy-paste issue fixed, as I can check on application.cutcopymode. But, I can't seem to find some equivalent for autofill.

Here's my code so far:

Code:

---

Private Sub Worksheet_Change(ByVal Target As Range)
    Dim rIsect As Variant
    Dim rWctr As Range
    Dim rCell As Range
    Dim rLookup As Range
    Dim MyCell As Variant
    Dim rList As Range
   
    '---Check to see if a workcenter was entered & look up the corresponding area if so---------
    Set rWctr = Me.Range("A:A")
    Set rCell = Me.Range("B:B")
    Set rLookup = ActiveWorkbook.Sheets("Areas").Range("A:C")
   
    'turn off events to prevent an infinite loop
    Application.EnableEvents = False
   
    Set rIsect = Application.Intersect(Target, rCell)
   
    If rIsect Is Nothing Then
        'the changed values do not include somthing from the cell column
        On Error GoTo e1
        For Each MyCell In Target
            If MyCell.Value <> "" Or MyCell.Value <> 0 Or MyCell.Value <> Empty Then
                Set rIsect = Application.Intersect(MyCell, rWctr)
           
                If rIsect Is Nothing Then
                    'do nothing
                Else
                    MyCell.Offset(0, 1).Value = Application.WorksheetFunction.VLookup(Target.Value, _
                        rLookup, 3, False)
                End If
            End If
r1:
        Next MyCell
    Else
        'the changed values DO include somthing from the cell column
        If Application.CutCopyMode = False Then
            'nothing is being cut or copied
            On Error GoTo e2
            For Each MyCell In Target
                If MyCell.Value <> "" Or MyCell.Value <> 0 Or MyCell.Value <> Empty Then
                    Set rIsect = Application.Intersect(MyCell, rWctr)
               
                    If rIsect Is Nothing Then
                        'do nothing
                    Else
                        MyCell.Offset(0, 1).Value = Application.WorksheetFunction.VLookup(Target.Value, _
                            rLookup, 3, False)
                    End If
                End If
r2:
            Next MyCell
        Else
            'something is being cut or copied, don't change anything
        End If
    End If

   
    'Other stuff (not related), cut out
    '...
       
    'turn events back on
    Application.EnableEvents = True
   
    Exit Sub
e1:
    If MyCell.Offset(0, 1).Value <> "" Or MyCell.Offset(0, 1).Value <> 0 _
        Or MyCell.Offset(0, 1).Value = Empty Then
        MyCell.Offset(0, 1).Value = "N/A"
    End If
    Resume r1
e2:
    If MyCell.Offset(0, 1).Value <> "" Or MyCell.Offset(0, 1).Value <> 0 _
        Or MyCell.Offset(0, 1).Value = Empty Then
        MyCell.Offset(0, 1).Value = "N/A"
    End If
    Resume r2
End Sub

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Even if I can't figure out how to tell if autofill is being used, can anyone think of any work-arounds to avoid the autofill problems?