How to extend Fuel Libraries

fireball

How can I extend fuel libraries?
For example in Codeigniter if I want to extend some library, just create MY_Library and use it in workflow.
I've tried to extend Menu fuel library with something like MY_Menu class, but doesn't work.

admin

FUEL doesn't offer that for it's own libraries except for if you need to overwrite module configurations (which is slightly different... more here on overwrites: http://docs.getfuelcms.com/modules/simple). You can always extend the library and use $this->load->library('MY_menu');
echo $this->my_menu->render(...);