Menu, submenu, pages

Hello.

I want to make menu with submenus trying to using wp_list_pages, but I have some problem. For example the menu on home page is:

* 1
* 2
* 3

I want to generate one level submenu if I click on one main level. For example if I click on 2 and if 2 have few levels, then click will show first level of 2:

* 1
* 2
** 2.1
** 2.2
*3

Next, if I click on 2.1 then will show next level of 2.1:

* 1
* 2
** 2.1
*** 2.1.1
*** 2.1.2
** 2.2
*3

I can’t find any solution. Is there any simple solution to make that menu?

Best regards.