Answering my own question, this helps greatly:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/odc_vis2003_ta/html/odc_vsprogrammingwithvisioactivexcontrol.asp



>Has anyone embedded an Visio drawing on a VFP form? What I'd like to be able to do is have the user view a drawing and click on an object in the drawing and get information about what that object is, but I'm not sure this is possible.
>
>Russell Campbell