---
id: fast-foundation.toolbar.childitemschanged
title: Toolbar.childItemsChanged() method
hide_title: true
---
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[@microsoft/fast-foundation](./fast-foundation.md) &gt; [Toolbar](./fast-foundation.toolbar.md) &gt; [childItemsChanged](./fast-foundation.toolbar.childitemschanged.md)

## Toolbar.childItemsChanged() method

<b>Signature:</b>

```typescript
protected childItemsChanged(prev: undefined | Element[], next: Element[]): void;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  prev | undefined \| Element\[\] |  |
|  next | Element\[\] |  |

<b>Returns:</b>

void
