Como quitar los botones de un MDIForm (Parent)

Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Const WS_MINIMIZEBOX = &H20000
Private Const WS_MAXIMIZEBOX = &H10000
Private Const GWL_STYLE = (-16)
Private Const MF_BYPOSITION = &H400
Private Const MF_REMOVE = &H1000
Private Declare Function DrawMenuBar Lib "user32" _
       (ByVal hwnd As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" _
       (ByVal hMenu As Long) As Long
Private Declare Function GetSystemMenu Lib "user32" _
         (ByVal hwnd As Long, _
         ByVal bRevert As Long) As Long
Private Declare Function RemoveMenu Lib "user32" _
         (ByVal hMenu As Long, _
         ByVal nPosition As Long, _
         ByVal wFlags As Long) As Long
Private Const SC_MINIMIZE As Long = &HF020&
Private Const SC_MAXIMIZE As Long = &HF030&
Private Const MF_BYCOMMAND = &H0&
Private Const SC_CLOSE = &HF060&

Private Sub MDIForm_Load()
Dim L As Long
Dim hMenu As Long
Dim menuItemCount As Long
L = GetWindowLong(Me.hwnd, GWL_STYLE)
L = L And Not (WS_MINIMIZEBOX)
L = L And Not (WS_MAXIMIZEBOX)
L = SetWindowLong(Me.hwnd, GWL_STYLE, L)
hMenu = GetSystemMenu(Me.hwnd, 0)
If hMenu Then
      Call RemoveMenu(hMenu, SC_MAXIMIZE, MF_BYCOMMAND)
      Call RemoveMenu(hMenu, SC_MINIMIZE, MF_BYCOMMAND)
     menuItemCount = GetMenuItemCount(hMenu)
      Call RemoveMenu(hMenu, menuItemCount - 1, _
                       MF_REMOVE Or MF_BYPOSITION)
     Call RemoveMenu(hMenu, menuItemCount - 2, _
                       MF_REMOVE Or MF_BYPOSITION)
     Call DrawMenuBar(Me.hwnd)
End If
End Sub