Option Explicit
 
Private Declare Function SetWindowPos Lib "user32" (ByVal hWnd As Long, ByVal _
  hWndInsertAfter As Long, ByVal x As Long, ByVal Y As Long, ByVal cx As Long, _
  ByVal cy As Long, ByVal wFlags As Long) As Long
Private Const SWP_NOMOVE = &H2
Private Const SWP_NOSIZE = &H1
 
Private Sub Form_Load()
   'Erst mal zweite Form laden:
   Form2.Show
   'Erste Form nach oben:
   SetWindowPos Me.hWnd, -1, 0, 0, 0, 0, SWP_NOMOVE Or SWP_NOSIZE
   Me.Show ' <-- Anzeigen der Form abschließen/sicherstellen
   'Zweite Form nach oben:
   SetWindowPos Form2.hWnd, -1, 0, 0, 0, 0, SWP_NOMOVE Or SWP_NOSIZE
'   'Erste Form nicht mehr oben: 
'   SetWindowPos Me.hWnd, -2, 0, 0, 0, 0, SWP_NOMOVE Or SWP_NOSIZE ' <-- _
  weglassen
End Sub