Option Explicit
 
' benötigte API-Deklarationen
Private Declare Function GetWindowLong Lib "user32" _
  Alias "GetWindowLongA" ( _
  ByVal hwnd As Long, ByVal nIndex As Long) As Long
 
Private Declare Function SetWindowLong Lib "user32" _
  Alias "SetWindowLongA" ( _
  ByVal hwnd As Long, _
  ByVal nIndex As Long, _
  ByVal dwNewLong As Long) As Long
 
Private Const GWL_STYLE = (-16)
Private Const WS_CAPTION = &HC00000
 
Private nOldStyle As Long

' Fensterstil ändern
Dim nStyle As Long
 
With Form1
  ' aktuellen Fensterstil merken
  nOldStyle = GetWindowLong(.hwnd, GWL_STYLE)
 
  ' Titelleiste entfernen
  nStyle = nOldStyle And Not WS_CAPTION
 
  ' Neuen Fensterstil setzen
  SetWindowLong .hwnd, GWL_STYLE, nStyle   
End With

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