Screen : Tab Focus : Mouse click within scene.

```
What steps will reproduce the problem?
1. Click on a control that can receive tab focus
2. Click into the scene

What is the expected output?

The control should release tab focus

What do you see instead?

No change

```

Original issue reported on code.google.com by `cristoff...@gmail.com` on 23 Jan 2013 at 7:29
