I'v seen some Visio solutions that enable a Stencil Navigation window docked to the left of the page, where it's possible to access several stencils arranged in folders. I've not seen how to access this window in the default menus and toolbars, and I've come across a project where this type of Stencil Navigation window would come handy. Do you know if it's a Visio window and if can it be launched by code, or is VBA UserForm custom built?
I've added a screen capture.
Best regards.