So I think this Sandcastle example is cool for showing off the grid material, but it kind of takes over the `Volumes` example.  If a user is trying to do something with grids, would their first instinct be to click on an example named `Volumes`?  And vise-versa, if I click on the Volumes example, I'm not confronted with something that is mostly about material manipulation, not drawing volumes.  Eventually, the Volumes example will grow to accommodate cylinders, cubes, and other volumes we plan on implementing.

I would put back the old Volumes example and either create a new 'Grid Materials' example, or simply move all of this code into the general 'Materials' example and only have it show up when Grid is selected (and pop up an ellipsoid as well).

This isn't a new issue, we need to improve the categorization and scope of all of our Sandcastle examples, so I'm sorry if I pontificated a bit.