Fix indelible dropdown menu

before:

![test1.png](https://f.cloud.github.com/assets/12539/1144452/685971ac-1d9b-11e3-855b-e522ddb32dea.png)

after:

![test2](https://f.cloud.github.com/assets/12539/1144455/a67f9cd6-1d9b-11e3-8c4b-d9c2d0cda5c3.png)