Preview bubble border improvement

Changes
---
Found a trivia fix for preview bubble border missing issue

Previous:
![border_missing](https://f.cloud.github.com/assets/4847382/1631056/5ee08e8c-575a-11e3-831c-6d2a95a81761.png)

Current:
![image](https://f.cloud.github.com/assets/4847382/1631061/873fcec4-575a-11e3-8a40-f9ee54f2351c.png)

MAGN-631