I am runing XL97 in Win95.

I am trying to prevent a user from disabling a userform using
Ctrl-Break. I know how to stop him from clicking on the X but he can
still press Ctrl-Break and get out from the code..
I am using the code below to trap Ctrl-Break error 18 but it doesn't
work and I can't figure out why.

No matter what I do I don't seem to get it to go to the ErrorHandler
while UserForm1 is showing.

There isn't anything on that in MSKnowledgebase.
Thanks for any help.

'This is in ThisWorkbook
Private Sub Workbook_Open()
Call On_Open
End Sub

'This is in Module1
Private Sub On_Open()
On Error GoTo ErrorHandler
Application.EnableCancelKey = xlErrorHandler
UserForm1.Show
ErrorHandler:
If Err.Number = 18 Then
UserForm1.Hide
MsgBox "pressed break"
End If
End Sub