How to implement a custom GroupTrack?

I want to implement a custom Track Sub-Group. Inheriting from UnityEngine.Timeline.GroupTrack doesn't allow to add children to it. I just can't figure it out what I have to write to make that work.

How can I implement a custom GroupTrack that allows me to add child-tracks to it? It doesn't need any mixing whatsoever, it just need to group a bunch of tracks to run some code at runtime over it.

PS: I'm using Unity 2021.3 and Timeline 1.6.4.

bump :)

bump :)

bump :)

I'm watching the thread just in case but watchout with Group Tracks :
https://discussions.unity.com/t/710046/3

[quote]
Group tracks are excluded from compilation of the PlayableGraph. They exist simply for organization purposes. We should have sealed the class. None of the compilation methods get called on them.
[/quote]

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