Stopping to dispatch KeyBoard events when you click twice on the same button which is skinPart.

Steps to reproduce:
1.Run App in debug mode (source attached).
2.Click ones on one of buttons and type something.
3. You will see "KeyDown" trace messages.
4. Click again on the same button and try to type something.
5. You should see that button stopped dispatching keyboard events.
6. Click on another button and type something.
7. You should see that button started dispatching keyboard events.

Actual Results:
Stopping dispatching KeyBoard events when you click twice on the same button which is skinPart.

Expected Results:
Dispatching KeyBoard events should't be depending on button clicking.