Hi Koen,
I solved it by writing a class WContainerWidget awares of his size. There is 
post on the forum
about that :
http://redmine.webtoolkit.eu/boards/2/topics/3955

I'm not interested for my project to use a WTreeView, but thx for your answer.

Regards,
Nicolas 

> Hey Nicolas,
> 
> A WTreeView will automatically shrink/grow the first column based on
> available width.
> If you want something else then you need to do it manually, see also this
> thread:
> http://redmine.emweb.be/boards/2/topics/2659
> 
> Regards,
> koen
> 
> 2016-07-13 5:23 GMT+02:00 Nicolas Jäger <jagernico...@legtux.org>:
> 
> > Hi,
> > I'm writing a small opensource filemanager with wt, and I want to display
> > the files like any
> > filemanager on a grid.
> >
> > I do not find a way to get a grid (or any other container) that can
> > grows/shrinks the number of
> > the columns automatically depending of the width. I want to avoid the use
> > of the horizontal
> > scrollbar.
> >
> > The best I found is :
> > https://css-tricks.com/almanac/properties/c/columns/
> >
> > But I have no idea how I can use this with Wt. Any suggestion is welcome.
> >
> > regards,
> > Nicolas Jäger
> >
> >
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What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are 
consuming the most bandwidth. Provides multi-vendor support for NetFlow, 
J-Flow, sFlow and other flows. Make informed decisions using capacity planning
reports.http://sdm.link/zohodev2dev
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