# Expander

The `Expander` control is a control that allows for expanding to show nested content.

### Reference <a href="#reference" id="reference"></a>

[Expander](http://reference.avaloniaui.net/api/Avalonia.Controls/Expander/)

### Source code <a href="#source-code" id="source-code"></a>

[Expander.cs](https://github.com/AvaloniaUI/Avalonia/blob/master/src/Avalonia.Controls/Expander.cs)