Hello, Prashant.
As an SCN Moderator I'd like to notify you that when someone of us is rejecting a post he (in most cases) gives an idea why. In your case I have clearly indicated that you 'violated' the rules of engagement and didn't perform the search before posting well. This note had to be attached to the email you've received.
Simple search gives a lot of information regarding your question. Because it's quite common and so is widely discussed on SCN already.
Just for your reference:
How to add new button to web ui view?
Configuring CRM Web Ui Assignment Blocks
hi what is the difference between do_prepare_output() and toolbar elements and methods ?
CRM - WebUI IT-Servicemanagement - Hide Buttons
https://www.google.com/search?q=site:scn.sap.com+sap+crm+button+add+webui
The thread is locked.
BTW, there are no exceptions because of any badges and levels.