Displaying Pages/Documents in a Category List

I am looking for a solution to expand the use of the Category List web part - I am very happy with the way the Category List web part can display a list of categories - but I would like for the list to also display a list of pages associated with a given category.

For example - I have setup Regions as a Category - and under that I have setup sub-categories: East, West, North, South. They display nicely in the Category List web part - and I can link to a list of pages associated with the specific region. But in the list itself it would be great if I could expand it one level further to show the pages associated to that selected region.

Something like this:

Region
  - East
  - West
  - North
        - Event 1
        - Event 2
  - South

Any ideas on how to configure the Category List web part to do this would be greatly appreciated.

Thanks!