A stencil under Visio Extras called "Dimensioning" has a center-line shape
for showing the center of a circle.
You can also format the line pattern to show the appropriate centerline
dash. (Format > Line > Pattern)
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Hope this helps,
Chris Roth
Visio MVP
"Ashraf" <***@discussions.microsoft.com> wrote in message news:69CA962C-AD5D-4692-9CC8-***@microsoft.com...