MyBB Hacks

Hello mybbhacks,
I want to know how to edit the {$extra_threadfields} variable
Currently in this place i see custom thread fields but i am working on tableless theme and i want to customize these columns with div in newthread and postedit.
Can i know where i can find this variable code so that i can change it
I can't find any template for this variable

$extra_threadfields is just an aggregation of the post_threadfields_inputrow template.

Thanks a lot ZiNgA BuRgA