- Option Explicit 
-   
- ' Para deshabilitar el menú cerrar (controlbox) de un formulario 
- Private Declare Function GetSystemMenu Lib "user32" _ 
-     (ByVal hWnd As Long, ByVal bRevert As Long) As Long 
- Private Declare Function ModifyMenu Lib "user32" Alias "ModifyMenuA" _ 
-     (ByVal hMenu As Long, ByVal nPosition As Long, _ 
-     ByVal wFlags As Long, ByVal wIDNewItem As Long, _ 
-     ByVal lpString As Any) As Long 
- Private Declare Function DrawMenuBar Lib "user32" _ 
-     (ByVal hWnd As Long) As Long 
- ' 
- Private Const MF_BYCOMMAND = &H0& 
- Private Const MF_ENABLED = &H0& 
- Private Const MF_GRAYED = &H1& 
- ' 
- Private Const SC_CLOSE = &HF060& 
-   
-   
- Private Sub Form_Load() 
-     ' Deshabilitar el botón de cerrar el formulario 
-     Dim hMenu As Long 
-     ' 
-     hMenu = GetSystemMenu(hWnd, 0) 
-     ' Deshabilitar el menú cerrar del formulario 
-     Call ModifyMenu(hMenu, SC_CLOSE, MF_BYCOMMAND Or MF_GRAYED, -10, "Close") 
-     ' 
- End Sub 
-