Version: Unity 6 (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.

Is something described here not working as you expect it to? It might be a Known Issue. Please check with the Issue Tracker at issuetracker.unity3d.com.

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