MUMUP-1278 : added event service function, added event handling for adding removing services

Category : Layout Modification
Actions : Add, Remove
Label : Title

![image](https://cloud.githubusercontent.com/assets/3534544/4868012/0f491790-613b-11e4-9a27-e1002cd1bc67.png)

![image](https://cloud.githubusercontent.com/assets/3534544/4868003/fe4c6460-613a-11e4-94ef-bd911c51b19e.png)