Em um módulo coloque
Public Declare Function GetSystemMenu Lib "user32" (ByVal hwnd As Long, ByVal bRevert As Long) As Long
Public Declare Function RemoveMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Public Const SC_CLOSE = &HF060&
Public Const MF_BYCOMMAND = &H0&
'-------------------------------------------------------
No Form MDI
Private Sub MDIForm_Load()
Dim hSysMenu As Long
hSysMenu = GetSystemMenu(hwnd, False)
RemoveMenu hSysMenu, SC_CLOSE, MF_BYCOMM
End Sub
T+
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