How can collapse the childItems on nested draggable?

[Niktex]

when i click on an arrow i want all the childs to collapse. What is the best way to do this? It is about nested draggable

[Niktex]

@David-Desmaisons would u look at this. I cant collapse the childs!

[Niktex]

A documentation for that or example would be awesome!

[victorLessa]

I need to

[Niktex]

My problem is if I collapse one parent the second parent also collapse

[Niktex]

Anyone with an idea?? The problem is that the other parent also collapse if I collapse the first parent!