Fixed the vertical alignment of the WindowsCommands

If the maximize, minimize and close buttons were hidden, the vertical
alignment of the WindowCommands was not centered

### Before:
![wrongalignment](https://f.cloud.github.com/assets/964691/548026/bd0f046e-c2d8-11e2-9564-b8abaab38835.png)

### After:
![correctalignment](https://f.cloud.github.com/assets/964691/548027/c2af3826-c2d8-11e2-8edc-ecb8c49d0e58.png)