creo que esto te ayudara:

Const SWP_NOMOVE = 2
Const SWP_NOSIZE = 1
Const HWND_TOPMOST = -1
Const HWND_NOTOPMOST = -2 '
 
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 Sub Form_Load()
   SetWindowPos Me.hWnd, HWND_TOPMOST, 0, 0, 0, 0, _
                            SWP_NOMOVE Or SWP_NOSIZE
End Sub

saludos