How to design a list with horizontal scollbar?

We know that the PtList does not have a horizontal scollbar,
but when the numbers of columns is excess the extent of the list,
some columns can’t be seen,so I want add a horizontal scollbar
for it,but I don’t know how to deal with it ,could somebody give me an
idea of design it?Thank you!

One way would be to have the PtList the size of all entries, then put it as a children of a PtScrollContainer.

That works. Lists and Trees will have horizontal scrollbars in 6.3.0 AFAIK.