Add footer button

Trying to add button in the footer using controller extension method, I do not find a detailed steps or code snippet apart from this link..

http://help.sap.com/fiori_bs2013/helpdata/en/20/f0df5215eb5c3fe10000000a423f68/frameset.htm

I tried the other way as well,  by inserting an extension (<core:ExtensionPoint name="extS3Footer"></core:ExtensionPoint>)  in the S3.View.xml, but the contents of the fragment never reflect in DOM

I am using SAP FIori tool kit, I do not use Web IDE...