View Single Post
If you have Parallels this is pretty easy.

Open the Stencil in Visio loaded in Parallels and do a screen grab using the "Shift + Apple +4" combo. A cross hair will appear, put it on your start point and drag it across to the end point. It will save to your desktop as a picture#.png, bring that into OmniGraffle, and save it off as a stencil set if you wish, or as a single item.

If you have a lot of items it is slow, but it can get a critical item from one format to the other.

HTH