---
id: fast-foundation.treeitem.expanded
title: TreeItem.expanded property
hide_title: true
---
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[@microsoft/fast-foundation](./fast-foundation.md) &gt; [TreeItem](./fast-foundation.treeitem.md) &gt; [expanded](./fast-foundation.treeitem.expanded.md)

## TreeItem.expanded property

When true, the control will be appear expanded by user interaction.

<b>Signature:</b>

```typescript
expanded: boolean;
```

## Remarks

HTML Attribute: expanded
