Version: Unity 6 Preview (6000.0)
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TreeViewItem.id

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public int id;

Description

Unique ID for an item.

This ID needs to be unique among all TreeViewItems and is used to identify a TreeViewItem.

If the tree is representing objects derived from UnityEngine.Object, it is a good idea to use the ID returned from GetInstanceID() for each object as the ID, as these are guaranteed to be unique.