[TYPO3-commerce] Show all products of all categories

[Franz Steinmetz]

Hi,

I work with commerce 0.9.8 and Typo3 4.2.12.

Until now I've had a shop with the following navigation:
List of categories => List of products of selected category => Details of 
selected product

Now I want to introduce a new page, which shows me all products, grouped by 
category. From here you get to the product detail page. This new page shell 
exist to the old navigation.

Can someone explain me how to do this? When i add the product listing plugin to 
this page with the root category as category, only the subcategories are shown 
(equivalent to "List of categries" in the existing navigation), but not their 
products.

Thanks

 Franz