Code in "This Workbook" not triggered

Excel 2003 on Windows10

I have two simple, similar workbooks.
Each has it's own associated Command Bar which is called up via an Auto Open module.
The command bar has just one button whose assigned macro closes the workbook.
In This Workbook, Workbook Activate and Workbook Deactivate are used to make the Command Bar visible true and visible false.
With both workbooks open, either can be selected as the active one using the standard Menu bar "Window" button.
The deactivated (or 'closing') workbook's associated command bar is made non-visible by the code in Workbook Deactivate
and the activated (or 'opening') workbook's bar made visible by the code in Workbook Activate.
All this works fine.

However, with both workbooks open, when one is CLOSED, Workbook Activate is NOT triggered in the other and vice versa.

The code is the same in each workbook, as follows:-

Please Login or Register  to view this content.

I cannot find why - any suggestions would be appreciated.

Administrative Note:

Welcome to the forum.

We would very much like to help you with your query, however the thread title does not really convey what your request is about. Tell us what you are trying to do, not how you think it should be done.

Please take a moment to amend your thread title. Make sure that the title properly explains your request. Your title should be explicit and not be generic (this includes function names used without an indication of what you are trying to achieve).

Please see Forum Rule #1 about proper thread titles and adjust accordingly. To edit the thread title, open the original post to edit and then click on Go Advanced (bottom right) to access the area where you can edit your title.

(Note: this change is not optional. No help to be offered until this moderation request has been fulfilled.)