The patch Accordeon CK - Virtuemart can show your categories.
This package has to be purchased for 9 €, it contains
- The patch file for Joomla! 2.5 and Joomla! 3
- Access to updates during 6 months
After payment you will be redirected to this website to download the product. If you encounter some difficulties contact me.
NOTE : No warranty nor support is furnished with this package, but I will do my best to help you if necessary.