Display list of pages with category

Hei

I’m trying to use the plug in “post tags and categories for pages”.
That’s really nice to add category to some of my pages.
Then, in the “Category” widget, I see the categories which are linked to some pages.

But if I click on one of this category, then the resulting page doesn’t dispplay anything (“It seems we can’t find what you’re looking for. Perhaps searching can help.”
If i click on a category which is also associated to some posts, I can see the lists of posts in the resulting page.

What can I do if I want the resulting page to display a list of posts AND pages associated to a category?
Thanks