Thanks, Rob. I used the Auto_Open/Auto_Close procedures. I did change
my code to use the Workbook_AddinInstall/Workbook_AddinUninstall, but
when I unselected the add-in from ToolsAdd-ins, nothing happened
unless I did something wrong. Now, with the Auto_Open/Auto_Close, the
menu items appears/disappears as I was hoping I could do.

Thanks again,
Mike.