# extensionContainer

> Empty container used to display custom elements. After adding elements, call RefreshExpandedState in order to toggle this container visibility.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor.Experimental.GraphView](/engine/6000.7/script-reference/unityeditor/experimental/graphview.md)
* **Assembly:** UnityEditor

```csharp
public VisualElement extensionContainer { get; }
```