Only allow selection in some parts of the UI and check hidden button pointer behavior

![image](https://user-images.githubusercontent.com/10409230/33093053-307dac8c-cefc-11e7-9e5f-40658ecd3c65.png)

![image](https://user-images.githubusercontent.com/10409230/33093060-369e8168-cefc-11e7-9d32-4248be8400df.png)

![image](https://user-images.githubusercontent.com/10409230/33093164-8106d8e0-cefc-11e7-8f4c-229f914f250e.png)
