Hi ,
First of thank you for all your replies. Its really helpful. Recently I have tried to override CreateReturnRequestController to include tax in returns calculation. I have followed the steps mentioned in the link below. But it was not picking up my controller. Then I replaced myextension-widget.xml with the customersupportbackoffice-widgets.xml and made changes to my project specific entries. I had to remove CustomerSupport-Perspective and created new widget then finally it worked. But I am really keen to know why steps mentioned in help.hybris to extend widget didn't work. I have attached all update xmls and screenshot of custom files. Could you please let us know the reason. Thanks once again.