[TYPO3-shop] Category filter - mbi categories

[Jogvan Olsen]

Hi

I have asked this question before, but didn't get any answer - and I 
haven't find a solution to my problem, so try once more...


Is it possibly to set a filter for the category?

I have a category tree like this (using mbi_products_categories):

Color (id=1)
    - black (id=2)
    - gray (id=3)
    - red (id=4)
Luster (id=5)
    - glossy (id=6)
    - semi gloss (id=7)
    ...

And I have products that have category 'black (id=2)' and category 
'semi gloss (id=7)' assigned to it.

I want to set up a page that ONLY show product that are assigned to BOTH 
the 'black (id=2)' AND 'semi gloss (id=7)' category. (only show 'black 
semi gloss' products)


I want to set up a page tree like this:

Select by color
  - Black
  - Black semi gloss
  - Black glossy
  - Gray
  - Gray semi gloss
...


If I use:
plugin.tt_products.defaultCategoryID =  2,7
in my setup, I get an 'or' combination - showing all products that are 
assigned to the 'black (id=2)' or 'semi gloss (id=7)' category. I only 
wants to show products where BOTH categories assigned to the same product.

I have tried to use the filter function, but get it to work.

Can anybody tell me how I can set this up?



I use
TYPO3 ver. 4.2.6
tt_products ver 2.8.0
mbi_products_categories ver. 0.4.4


Thanks  in advance
Jogvan Olsen