Dropdown look and fix in Message Select user modal view

Testing Instructions:
![pm before](https://f.cloud.github.com/assets/2002921/787642/9761319a-eadf-11e2-93de-2fd5cc5e8fb1.png)
![pm](https://f.cloud.github.com/assets/2002921/787645/a08f1ed0-eadf-11e2-9134-e50c6019067d.png)