Remove X from UserForm

Hi,
I have some code to remove X button from the UserForm. Problem is that each time I change UserForm's caption X button appears again. I could run that code each time I change caption, but I change it each half a second, so this approach is not desirable. Could anyone suggest me a way to make a permanent X button disappearance?
Also, do I need to use DrawMenuBar, it works well without calling this API?

Code:

Code:

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Option Explicit
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
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 DrawMenuBar Lib "user32" (ByVal hWnd As Long) As Long

Private Const GWL_STYLE As Long = (-16)
Private Const WS_SYSMENU As Long = &H80000

Private Sub UserForm_Activate()
Dim lFormHandle As Long, lStyle As Long

If Application.Version < "9.0" Then
    lFormHandle = FindWindow("ThunderXFrame", Me.Caption)
Else
    lFormHandle = FindWindow("ThunderDFrame", Me.Caption)
End If

lStyle = GetWindowLong(lFormHandle, GWL_STYLE)

lStyle = lStyle And Not WS_SYSMENU
SetWindowLong lFormHandle, GWL_STYLE, (lStyle)
DrawMenuBar lFormHandle

End Sub

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