https://docs.microsoft.com/en-us/office/vba/api/visio.containerproperties.overlappedlist
Would any one know what the overlappedlist property of containerproperties does or what it is usefull for?
Spent half an hour googling the subject with no success.
My guess, this deals with the specialized List Container...well, at least two. Basically, it checks for duplications, I think. See this concerning Lists. You'll need to scroll down aways. [url][https://techcommunity.microsoft.com/t5/microsoft-365-blog/custom-containers-lists-and-callouts-in-visio-2010/ba-p/237586/url]
Nor really had any hands-on experience with it, though.