Wordpress menu and child items

how can i get the children items of an 开发者_StackOverflowactive menu in WP?!

I display menu with wp_nav_menu(), but i wonna display the child items in another block.

Thx

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There are some long code examples here: WordPress › Support » wp_nav_menu: List only 2nd level (separate submenu)?

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I'm sure that isn't possible without any custom code.

How about this plugin? http://wordpress.org/extend/plugins/wordpress-navigation-list-plugin-navt/