Gnome 3 extensions resources

Question

I just installed gnome 3 and I added a few extensions, I noticed they are coded in JS but I don't fully understand how they work.

What I am really interested right now is learning how I could add a clickable icon at the left of this extension bottom-panel (code: http://pastie.org/private/w1kkcrr1lr95ujepp0lxg)

Where can I learn how to do that?

Answer 1

I managed to do it by mixing two extensions, bottom-panel and show-desktop-button, credits for the code goes to their respective creators.

extension.js : http://pastie.org/private/xilvfei4jbfebs2bdswlq

stylesheet.css : http://pastie.org/private/ldarwadqnuqvl0stncfmsw