Can any help with CUBESET function?

I am learning CUBE functions. The only one I can't get to perform is CUBESET.

Here's my scenario:

I've constructed an offline OLAP Cube using Access Northwind (as explained
in http://wang.se/en/CreateOLAPCube.html). Columns I am using are
CompanyName, Country, Quantity, Subtotal, OrderDate, ProductName,
CategoryName.

My OLAP Cube Dimensions a
Customer -- Country -- CompanyName
Product -- CategoryName -- ProductName
OrderDate -- Year -- Quarter -- Month -- Week -- Date

Next I've read articles in MSDN Blogs on CUBE Functions and followed the
examples in CUBE Functions 2: A Few Examples.

The CUBEMEMBER functions and the CUBEVALUE functions perform fine. But I
have yet to be able to construct anything using CUBESET to create a set of
All Products Sold.

Anybody out there who can guide me to the winning combination of terms in
the SET_EXPRESSION that I need to have a working CUBESET?

I'll be eternally grateful to anyone who can deciper this.