How to add a custom subpanel by code and which files are needed

Hello everyone,

I need to add a custom subpanel by code (not from the GUI) but I don’t understand which files I have to edit.
Could you please help me?

Thank you,

Marco

Have a look here:
http://urdhva-tech.blogspot.com/2013/02/add-custom-subpanel-in-accounts-module.html