# TrickleDown

> Use this enum to specify during which phases the event handler is executed.

## Definition

* **Type:** Enum
* **Namespace:** [UnityEngine.UIElements](/engine/6000.0/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public enum TrickleDown
```

## Fields

| Value                                                                                                | Description                                                                      |
| ---------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- |
| [NoTrickleDown](/engine/6000.0/script-reference/unityengine/uielements/trickledown/notrickledown.md) | The event handler should be executed during the AtTarget and BubbleUp phases.    |
| [TrickleDown](/engine/6000.0/script-reference/unityengine/uielements/trickledown/trickledown.md)     | The event handler should be executed during the AtTarget and TrickleDown phases. |