Dynamic expansion of armor re-layering window

For comparison:
- was:
![armor_was](https://f.cloud.github.com/assets/5421954/2304315/40f0096e-a216-11e3-8652-b09b2805af8f.png)

- is:
![armor](https://f.cloud.github.com/assets/5421954/2304316/483e34d4-a216-11e3-9cbf-04431dc65159.png)