# Collapsing

**RadRibbonView** supports collapsing, which means that the control will automatically set the **Visibility** of its main panel to **Collapsed** to save space. This happens when the window in which the control is hosted is resized to a size smaller than the **CollapseThresholdSize**.

> You can access the **RadRibbonView** control through an alias pointing to the **Telerik.UI.Xaml.Controls** namespace: `xmlns:telerik="using:Telerik.UI.Xaml.Controls"`

## Properties

The following properties are related to the collapse functionality:

* **IsCollapsed**: A property of type **bool**, which gives information about the current state of the **RadRibbonView** control. This property is **read-only**.

* **CollapseThresholdSize**: A property of type **Windows.Foundation.Size** which allows you to control the threshold for collapsing. The default value is **300, 250**.

#### **Example 1: Setting the CollapseThresholdSize**

```XAML
<telerik:RadRibbonView x:Name="radRibbonView" CollapseThresholdSize="100,100">
	...
</telerik:RadRibbonView>
```

## Events

You can use the **CollapsedChanged** event to be notified when collapsed state of the ribbon is changed.

#### **Example 2: Adding a handler to the CollapsedChanged event**

```XAML
<telerik:RadRibbonView x:Name="radRibbonView" CollapseThresholdSize="100,100" CollapsedChanged="radRibbonView_CollapsedChanged">
 ...
</telerik:RadRibbonView>
```

#### **Example 3: Handling the CollapsedChanged event**

```C#
private void radRibbonView_CollapsedChanged(object sender, Telerik.Windows.RadRoutedEventArgs e)
{
	RadRibbonView ribbonView = sender as RadRibbonView;
	bool isCollapsed = ribbonView.IsCollapsed;
}
```

> For more information about the events exposed by the **RadRibbonView**, check out the [Events](https://www.telerik.com/winui/documentation/controls/radribbonview/events-overview) topic.