Fix for the bug that breaks other panels in the devtools.

With reference to our discussion [here](https://groups.google.com/forum/?fromgroups=&hl=en#!topic/google-chrome-developer-tools/Nco5aGRHHag), I've found a way to fix that bug. Since we want to target only the Elements panel in the devtools (that is the first tab), all we need to add is the .elements class to our selectors. Tested on Chrome 23 on Linux.