The min/max/close buttons can be tabbed to...

...but that should not be the case. Create an empty MetroWindow, add some control, and run it. Start tabbing around, and you will see the min/max/close buttons with a focus rect. This is the case regardless of the WindowCommands being used or not. See screen shot.

![minmaxclosebuttons](https://f.cloud.github.com/assets/631724/59959/5b9cebac-5bee-11e2-9dd3-c41e5e952a6b.png)

See the changes made in this branch, which fixes the issue.