borisyankov/DefinitelyTyped — pull request #1603 by derekcicerone (2014-01-24 00:04:58+00:00)
Title: Create slick.headerbuttons.d.ts

Headerbuttons is a SlickGrid plugin so I put it in the slickgrid directory:
https://github.com/mleibman/SlickGrid/blob/master/plugins/slick.headerbuttons.js?source=cc