With the shape you found on John Marshal’s Visio Information site, you can do this:

1. Configure the shape as you want (number of sides, etc)
2. Go to: Shape > Operations > Fragment.

This will create a “dumb” shape that you can freely resize, but the ability to change the number of sides will be lost.

- Chris

Very nice macro indeed.
Concerning the creation of polygons, I just found out an other polygon maker in the “download section” of Visio’s MVPs website:

I think though that this shape behaves oddly.. you cannot resizing it by dragging…

just what I needed ….

thank