How to get children from tree view

Development Programming & Scripting UI
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Im trying to make a Tree view widget and I got a check box in an entry widget. The point is, if check state of parent changed children should change it too. But the question is how to get list of children of unique entry widget not like items, but like widgets too.
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The only way is to use GetDisplayEntryWidget, but it gives all the widgets and I can’t get their parent widgets to check the state.
Do anybody knows how can i make it?

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I didn’t find the way to make it through tree view, so I’ve made a struct with all my Items and a widget refs. On item set i added widgets, and on destroy I deleted them. I also added a component to each item that consists insexes of this item, so i could always get nessesary item, parents and children. So, everything depends on ur parent-children architecture.