hMenu = GetSystemMenu(Me.hwnd, 0)
If hMenu <> 0 Then
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


Forse qualcosa del genere? nasconde la X?