Once in menu you'll see new option. Container Element. which lets you control which HTML tag is wrapped around the sidebars that output into the menu..
This is because you will have accidentally created recursion if the menu contained in sidebar is the menu sidebar is placed in you'll have unlimited loop that will do not good them.
Adding region from the hill will add it the menu with many sidebar-specific menu application like Label Display and Container Element.
What you choose here depends on and CSS you will probably want to set this to games the sidebar is usually displayed within for example.
But WordPress menu system is also somewhat limited in that usually only offers application for links to individual posts of all types categories and tags in gift to generic.
Because sidebars can contain menus and menus can also contain sidebars it's to accidentally create problem where WordPress gets need in loop outputting inside inside inside sidebar. etc.
Because the category of sidebar regions are attached to special themes different themes have different regions when all if you place sidebar that referred to theme into and then shift themes the sidebar will not be shown in menu.
If you're using topic and its regions are defined in the subject everything will work ticket long as you configured the category of these regions in the subject theme...
Browse the code recheck out SVN repository or subscribe to the development log RSS....
Registering the metabox with the list of regions later in the hopes of catching any regions defined in the not right hook.
Read more