Disable prompt when deleting sheets in VBA not working

Hi everybody,

I've been looking since a long time to find what's going wrong, but can't find out what I'm doing wrong.
I want to disable the prompt when deleting sheets in my workbook, but I still get a prompt for deleting the sheets even if Application.DisplayAlerts = False is in my code.

Any suggestions how I can fix this ?

Thx !

This is my code:

Sub KopieerVorigePrestatiestaatTabblad()

Application.ScreenUpdating = False
Application.DisplayAlerts = False If FileExists = True Then

Set BR = Workbooks.Open(BRPath & BRName)

BR.Sheets(ControlPanel.ComboBoxMaand.Value).Copy Before:=Prestatiestaat.Sheets("Blad1")
BR.Close (False)

Prestatiestaat.Sheets("Blad1").Delete
Prestatiestaat.Sheets("Blad2").Delete
Prestatiestaat.Sheets("Blad3").Delete

Prestatiestaat.Sheets(ControlPanel.ComboBoxMaand.Value).Name = ControlPanel.ComboBoxMaand.Value & " (BASIS)" 'hernoem het tabblad

'BreakLinks 'Wordt in volgende stap gedaan

Else

MsgBox ("Kan prestatiestaat niet maken omdat bestand Basisrooster " & ControlPanel.ComboBoxAfdeling & " " & ControlPanel.ComboBoxJaartal & " niet kan gevonden worden.")
End

End If

Application.DisplayAlerts = True

End Sub