# trackingHandler

> Function to call when tracking the selection in the advanced Object Selector. Only available during AdvancedObjectSelectorEventType.OpenAndSearch.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor.SearchService](/engine/6000.6/script-reference/unityeditor/searchservice.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public Action<Object> trackingHandler { get; }
```

### Remarks

This function takes a single parameter: the object to track, or null to clear the selection.