Is it possible to have expandable / collapsable columns and row content?

[lgn-lvx3]

Doesn't look like through the documentation and demo that you can adjust the width of the columns either manually or by dragging (ideally).

Also if you click on a row, expand more content for that row. Is there a way to do this through this library or can we do this through the Bootstrap library possibly?

Really appreciate the work on this project, thank you.