BeforeClose Event

Occurs before the workbook closes. If the workbook has been changed, this event occurs before the user is asked to save changes.

Cancel   False when the event occurs. If the event procedure sets this argument to True, the close operation stops and the workbook is left open.

Example

This example always saves the workbook if it's been changed.

Private Sub Workbook_BeforeClose(Cancel as Boolean)
    If Me.Saved = False Then Me.Save
End Sub