How to detect when a workbook is closing?

Question

The Workbook.BeforeClose event triggers when the workbook is about to close but before the saving message prompt which allows cancelling it.

How can I detect when the wo

Answer 1

This is an evolution of my 1st Answer - it detects the edge case problem by comparing the ActiveWindow.Caption against ThisWorkbook.Name so it can detect that issue and deal with it. It's not the most elegant solution but I believe it works.

All Code in the Workbook most of it in DeActivate

Public ByeBye As String

Private Sub Workbook_BeforeClose(Cancel As Boolean)
   ByeBye = "B4C"
End Sub

Private Sub Workbook_Deactivate()
   If ByeBye = "B4C" Then
      If ActiveWindow.Caption = ThisWorkbook.Name Then
         If ThisWorkbook.Saved Then
            MsgBox "No problem - Closing after Saving"
         Else
            MsgBox "No problem - Closing without Saving"
         End If
      Else
         If ThisWorkbook.Saved Then
            MsgBox "No problem - New Workbook Activation"
         Else
            MsgBox "Oops Try Again You Cannot Activate '" & ActiveWindow.Caption & "' until '" & ThisWorkbook.Name & "' has completed processing & IT HAS NOW COMPLETED", vbOKOnly, "Hiding"
            ThisWorkbook.Activate
         End If
      End If
   Else
      MsgBox "No problem - Just Hiding"
   End If
   ByeBye = "Done"
End Sub

Private Sub Workbook_Open()
   ByeBye = "OPENED"
End Sub

In response to comment about saving I tested this for 7 possible combinations as follows

 1) Closing without Edits - No Saving Involved ... MsgBox Prompted with ... No problem - Closing after Saving       
 2) Not closing - Just Switch Workbook - Whether Edited or Not ... MsgBox Prompted with ... No problem - Just Hiding        
 3) Not closing - Switch Workbook - After Edit & Cancel ... MsgBox Prompted with ... Oops Try Again …       
 4) Closing and saving ... MsgBox Prompted with ... No problem - Closing after Saving       
 5) Closing and Saving after a prior Cancel ... MsgBox Prompted with ... No problem - Closing after Saving      
 6) Closing but Not Saving ... MsgBox Prompted with ... No problem - Closing without Saving         
 7) Closing but not Saving after a prior Cancel ... MsgBox Prompted with ... No problem - Closing without Saving