Cell disappear in 0.1.1 when selected

0.1.1:
![0 1 1](https://cloud.githubusercontent.com/assets/904442/2594512/a049e412-ba8e-11e3-9627-bc6104cfe927.gif)

0.1.0:
![0 1 0](https://cloud.githubusercontent.com/assets/904442/2594513/a933492e-ba8e-11e3-9e45-861bc3588b38.gif)

It seems OK after removing `attributes.zIndex = 1;`