# OnCreateUI()

> The VisualElement that this method returns is embedded in the Device Simulator window. If the method returns null, plug-in UI is not embedded.

## Definition

* **Type:** Method
* **Namespace:** [UnityEditor.DeviceSimulation](/engine/6000.6/script-reference/unityeditor/devicesimulation.md)
* **Assembly:** UnityEditor.DeviceSimulatorModule

```csharp
public virtual VisualElement OnCreateUI()
```

### Returns

| Type                                                                                     | Description |
| ---------------------------------------------------------------------------------------- | ----------- |
| [VisualElement](/engine/6000.6/script-reference/unityengine/uielements/visualelement.md) |             |