I want to tweak the top panel of the window,and I founded two kits named "wingpanel-slim" and "super-wingpanel" can do what I want to (auto hide and ...)
I tried to install the from several PPA but no one success.
super-wingpanel were developed and maintained by a developer on Launchpad called ~heathbar. Unfortunately, it looks like he abandonded both projects and did not update them to work with Freya (last change to
wingpanel-slim was 2013-11-19, last change to
super-wingpanel was 2014-03-04).
Therefore, sadly, there is (currently) no way to use one of those on Freya. Maybe development will be resumed by someone else, but at this very moment, it's simply not possible.