# id

> Unique ID for an item.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor.IMGUI.Controls](/engine/6000.6/script-reference/unityeditor/imgui/controls.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public virtual TIdentifier id { get; set; }
```

### Remarks

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.