I need to gather articles from multiple categories into the single blog feed (the front page and main RSS feed).

For example, I need this structure ...

```
Section 1
  Category 1.1
    Article 1.1.1 (20 apr 2011)
    Article 1.1.2 (10 apr 2011)
  Category 1.2
    Article 1.2.1 (15 apr 2011)
  Category 1.3
    Article 1.3.1 (25 apr 2011)

```

... to be displayed in a single blog as

```
Article 1.3.1 (25 apr 2011)
Article 1.1.1 (20 apr 2011)
Article 1.2.1 (15 apr 2011)
Article 1.1.2 (10 apr 2011)

```

(sorted by the creation date of articles)

I tried to use "Section Blog" type for my menu item, but I can't understand its methods of sorting articles. I tried to sort them by date, but my section blog displaying it category by category, not article by article:

```
Article 1.1.1 (20 apr 2011)
Article 1.1.2 (10 apr 2011)
Article 1.2.1 (15 apr 2011)
Article 1.3.1 (25 apr 2011)

```

Maybe I should install some extension to do that?

Joomla 1.5.22