Adding thickness to a PieSliceVisual3D

I've been using Helix3D for my project to show pie charts and they work well for when the camera is looking directly at it. But when the camera is looking at one from the side, the PieSliceVisual3D doesn't have any thickness and can't be easily seen.

What I need is a PieSliceVisual3D with some sort of thickness or depth to it. I was looking around and it seems like MeshBuilder has something for extruding shapes, but I couldn't find anything else.

How would I thicken or extrude a PieSliceVisual3D? Are there any examples for doing this?

There is some extrusion functionality in the MeshBuilder. I don't think there is an example so I have added https://helixtoolkit.codeplex.com/workitem/10069