# itemsSource

> Items for this tree.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.UIElements](/engine/6000.6/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public override IList itemsSource { get; set; }
```

### Remarks

It can only be accessed. Source is set when tree is rebuilt using [BaseTreeViewController.RebuildTree()](/engine/6000.6/script-reference/unityengine/uielements/basetreeviewcontroller/rebuildtree.md)