NEXUS-7675 makes metrics use the plain subsection frame

Before:
![screen shot 2014-11-17 at 3 23 14 pm](https://cloud.githubusercontent.com/assets/186715/5079868/c3b85a12-6e6d-11e4-8358-0bdd27e264e2.png)

After:
![screen shot 2014-11-17 at 3 16 18 pm](https://cloud.githubusercontent.com/assets/186715/5079879/cb635cd0-6e6d-11e4-89a9-2e71b678b5fd.png)