I have an issue about scrolling with opened branches.
For usability reasons it would be convenient to show the parent row always on top. Is there any possibility to solve this?
Unfortunately, treetable (its inner grid) have no such feature, as it works with hierarchical data structures.
The topSplit and freezeRow features are supported only in the ui.datatable (data widget with a plain one-level data structure).
Maybe it will be interesting for you:
in Webix you can insert a sub-grid or a sub-form into Datatable
sub-grid can be useful: https://snippet.webix.com/a9064220
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