Version: 2017.3 (switch to 2017.4)
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TreeView.SetExpandedRecursive

public void SetExpandedRecursive(int id, bool expanded);

Parameters

id TreeViewItem ID.
expanded Expanded state: true expands, false collapses.

Description

Expand or collapse all items under item with id.

This is also used internally when Alt/Option + clicking an foldout arrow of an item to expand/collapse the entire sub-tree under this item.

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