# AddChild(TreeViewItem)

> Helper method that adds the child TreeViewItem to the TreeViewItem.children list and sets the parent property on the child.

## Definition

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

> **Warning:**
>
> **Removed.** TreeViewItem is now deprecated. You can likely now use TreeViewItem\\\<int\\> instead and not think more about it. But if you were using that identifier to store EntityId data, you should instead opt to upgrade your TreeViews to use TreeViewItem\\\<EntityId\\> to get the proper typing.

```csharp
public void AddChild(TreeViewItem child)
```

### Parameters

**** (\[TreeViewItem]\(/engine/6000.6/script-reference/unityeditor/imgui/controls/treeviewitem)): TreeViewItem to be added to the children list.