How to remove ribbon buttons from ribbon - Sharepoint 2010

If you want to remove some buttons from sharepoint 2010 ribbon, here is a simple way to do it

Add the new item Empty Element from the vs 2010 and put this part inside Elements.xml

Here i am removing the "StartWorkflow" button from publishing tab

to get list of ribbon button locations you can see this link http://msdn.microsoft.com/en-us/library/ie/ee537543.aspx.