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I tried it with the function extracted from this page:

http://codex.wordpress.org/Function_Reference/wp_nav_menu#How_to_add_a_parent_class_for_menu_item

I added the code to my functions.php, but I can't find any element with the class 'parent-menu-item', despite having several pages with sub-items in my WordPress installation.

What could I possibly be doing wrong here? Any other functions in my functions.php are working without problems.

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Can you show me the code and send me the site URL? –  Vinod Dalvi Apr 15 '13 at 9:04
    
The site URL is uklose.ks1.klose-it.de/ssgbs. The code in my functions.php has been copy & pasted from the URL mentioned in my original post, I changed nothing. Thanks for your help. –  ulf Apr 15 '13 at 9:45
    
You're aware that there are already parent and ancestor classes by default? current_page_ancestor and current_page_parent ? There are variants for menu ancestors where the item is a link or post rather than a page too, you don't need a custom class –  Tom J Nowell Apr 15 '13 at 10:39
    
What I want to achieve is that in my main menu, if an element has child elements there should be a special icon near the element itself to show that there's a list of children to display. –  ulf Apr 15 '13 at 13:26
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