LibreOffice Tree with columns

Анна Чернова anchrnv at
Fri Dec 24 05:34:21 UTC 2021

Please, help me find information, if you can.

I am writing an extension for LibreOffifce.
A tree with columns on my sidebar is needed. (example -

I found information about Tree Controls and module "tree", e.g. here

But I couldn't find anything about writing a *tree with columns*.

There is a quote "You can provide your *own model* which must at least
support the interface" in the  article "Tree
control", but I also couldn't find any information about providing of my
own models...
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