No luck in hidding the buttons from fiori extended app of ca_fiori_inbox

hello,

I need to hide claim , forward suspend buttons.

I created the fiori extension for the extension app and wrote the below code:

Under s3Custom.controller.js

extHookChangeFooterButtons: function(oButtonList){

     oButtonList.getIdForLabel()("XBUT_CLAIM").setVisible(false);

     oButtonList.getIdForLabel()("XBUT_RELEASE").setVisible(false);

     oButtonList.getIdForLabel()("XBUT_FORWARD").setVisible(false);

     oButtonList.getIdForLabel()("XBUT_CONFIRM").setVisible(false);

  }

However nothing is happening. no error as well.

please suggest.