masayuki0812/c3 — pull request #633 by derek-schultz (2014-10-16 18:23:17+00:00)
Title: Add tooltip ungrouping for multiple X. Fix #628.

My clumsy attempt at fixing #628. It doesn't behave exactly like the single X scenario, but if I get some hints on how to achieve that, I would be willing to continue working on this.