[RESOLU] : Liste deroulante

Private Sub Worksheet_Change(ByVal Target As Range)
Dim cel As Range, x, t, d As Object, i&, a
Set cel = [F9] 'à adapter
If Intersect(Target, cel) Is Nothing Then Exit Sub
x = cel
t = [A1].CurrentRegion
Set d = CreateObject("Scripting.Dictionary")
For i = 1 To UBound(t)
  If t(i, 1) = x Then d(t(i, 2)) = ""
Next
If d.Count Then
  a = d.keys
  tri a, 0, UBound(a)
  cel(1, 2).Resize(d.Count) = Application.Transpose(a)
End If
cel(d.Count + 1, 2).Resize(Rows.Count - d.Count - cel.Row + 1).Delete xlUp
End Sub

Sub tri(a, gauc, droi)       ' Quick sort
Dim ref, g, d, temp
ref = a((gauc + droi) \ 2)
g = gauc: d = droi
Do
    Do While a(g) < ref: g = g + 1: Loop
    Do While ref < a(d): d = d - 1: Loop
    If g <= d Then
      temp = a(g): a(g) = a(d): a(d) = temp
      g = g + 1: d = d - 1
    End If
Loop While g <= d
If g < droi Then Call tri(a, g, droi)
If gauc < d Then Call tri(a, gauc, d)
End Sub