Code below Deletes the Toolbar when the Workbook is closed:
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Private Sub Workbook_BeforeClose(Cancel As Boolean)
' If the toolbar is stored in a particular workbook -- it will still be there when the workbook or Add-In opens. Place this code in the workbook code area. Since an Add-In doesn't close until Excel is closed, there's no window to close, the toolbar wouldn't be deleted until then.