Ok. I have created this file.
Subs-MenuMultiLevel.php with the code presented.
I have edited the load.php file as presented as well.
(I have tried 2 versions, the one below and another where I added the
add_integration_function('integrate_menu_buttons', 'menu_multi_level', false);
add_integration_function('integrate_pre_include', '$boarddir/Sources/Subs-MenuMultiLevel.php', false);
after the '}"
And this one.
// Integration is cool.
if (defined('SMF_INTEGRATION_SETTINGS'))
{
$integration_settings = unserialize(SMF_INTEGRATION_SETTINGS);
foreach ($integration_settings as $hook => $function)
add_integration_function($hook, $function, false);
add_integration_function('integrate_menu_buttons', 'menu_multi_level', false);
add_integration_function('integrate_pre_include', '$boarddir/Sources/Subs-MenuMultiLevel.php', false);
}
In both cases, I still don't see the extra button. I must be doing something wrong. :-(
Using 2.0.09, default SMF theme.