How do I add nested categories to drop-down menu in twenty-eleven?

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I know how to do it by writing a separate ul/li css for wp_list_categories, but I find menus of “twenty eleven” already well designed and flexible, so I`d like to use them.
Custom menus, when I have to add subcategories manually, are not a solution, sinse I will allow my users to create new categories. What would you do?

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  1. As a purely theory example, this is how I would approach the problem:

    $cats = get_categories();
echo '<ul>';
foreach($cats as $cat) {
    echo'<li>'.$cat->name;
    if($cat->parent != 0) {
       $subcats = get_category('child_of='.$cat->cat_ID;
       echo '<ul>';
       foreach($subcats as $subcat){
        echo '<li>'.$subcat->name.'</li>';
       }
    }
    echo '</li>';
}
echo '</ul>';

    I don’t expect that to work fully as I coded it there based of this codex entry but I am fairly certain that my theory is correct. I may have the $cat->parent backwards though…