It will be better when the sidebar have too many displayd 2nd level hiarchi files, that you always see the mother folder on the top like on the ios list view. That gives me a better orientation when Im in a deep folder hiarchy (any framework etc.) to know in witch current folder I am currently.
http://media.idownloadblog.com/wp-conte ... t-list.jpg
See the "A" is the title of de current section.
of course this idea must to be better concepted and cannot copied 1:1 from ios