How to bind external buttons with Buttons extension for colVis

sheel

Hello,

I am creating column hide and show with Buttons extension of Datatables. As per this example https://www.datatables.net/extensions/buttons/examples/column_visibility/columnGroups.html, able to hide and show column group.

But my requirement is to add button on column header with colspan. Please find expected dom in following link,
http://live.datatables.net/qegewola/1/edit

As per example I want to bind column hide/show (toggle) on "◄ ".