Implemented hover support, etc.

![grid2 mov](https://cloud.githubusercontent.com/assets/262517/4067248/3f94d570-2e2c-11e4-96af-c5eecc3a4d36.gif)

![hover mov](https://cloud.githubusercontent.com/assets/262517/4067268/73680cfa-2e2c-11e4-8d46-22cbf1e3b73c.gif)