I just also desperatly searched something like that and needed also to create not only classes diagram, but sequence diagram
I failed to make full createobject('visio.application') and to put all infor I had in VFP to it
So , I have spent 10 days making it manually.
Now I try to make some exprot from VFP, Visio can read.
Strange, the liest of import types and export types in Visio is very unsimetric
If I can export secuence diagram I made by hands to look it format and later
to do same , but it is not possible, because import types are absolutly different from export types.
Vladimir