Visio UIObject and Adobe PDFMaker menu problems

My basic VBA project adds a Menu item to the Custom Menus collection for the active drawing. However it doesn't play nicely with the Adobe PDFMaker menu.
 
Specifically the Custom menu that PDFMaker adds seems to ignore the fact that other Custom menus might be added to the active drawing, or session or application. My workaround is to add my custom menu, then remove it, wait some time, then add it again.
 
I have searched many internet fora for this issue and discovered that many people believe that the issue is with the Adobe PDFMaker menu. What is the recommended way for VBA authors to add menu items that need to co-exist with the PDFMaker menu?
 
Thanks,
 
Ben