webix.CustomScroll no effective for tree

Webix JS
1

http://webix.com/snippet/e49510cf

2

I can confirm the issue, it will be fixed in the next build.
As quick solution you can enable the custom scroll directly on the html container

http://webix.com/snippet/743f4333

3

Hi maksim, v.2.1.12 still has this issue?

4

Yep, it was not included.
I have sent you a link to the fixed package by private message