List categories based on current product

Question

Using WP e-commerce I'm trying to display the product categories inside the major category of the product I am viewing:

Example:

• Major Cat A

  1. Cat 1

     a. Minor 1a <-- I am viewing an item here

  2. Cat 2

  3. Cat 3

• Major Cat B

While in the Minor 1a or the Cat 1 category, I want to display the first level of categories in the Major Cat A.

I tried using wpsc_start_category_query and similar methods but with no luck. How is this possible?