# hierarchyWindowChanged

> A callback to be raised when an object in the hierarchy changes. Each time an object is (or a group of objects are) created, renamed, parented, unparented or destroyed this callback is raised.

## Definition

* **Type:** Field
* **Namespace:** [UnityEditor](/engine/6000.0/script-reference/unityeditor.md)
* **Assembly:** UnityEditor

> **Warning:**
>
> **Deprecated.** Use EditorApplication.hierarchyChanged

```csharp
public static EditorApplication.CallbackFunction hierarchyWindowChanged
```

### Remarks

Additional Resources: [EditorWindow.OnHierarchyChange()](/engine/6000.0/script-reference/unityeditor/editorwindow/onhierarchychange.md).

```csharp
using UnityEditor;
using UnityEngine;

public class ExampleCode
{
    [MenuItem("Example/Hierarchy Window Changed")]
    static void Example()
    {
        EditorApplication.hierarchyWindowChanged += ExampleCallback;
    }

    static void ExampleCallback()
    {
        Object[] all = Resources.FindObjectsOfTypeAll(typeof(Object));
        Debug.Log("There are " + all.Length + " objects at the moment.");
    }
}
```

**Note:** Changing the HideFlags on an object will also cause this callback to be called.