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Expander.Collapsed Event

Occurs when the content window of an Expander control closes and only the Header is visible.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public event RoutedEventHandler Collapsed
<object Collapsed="RoutedEventHandler" .../>

Identifier field


Routing strategy




The Collapsed event occurs when the IsExpanded property changes from true to false.

The following example shows how to specify the event handler for the Collapsed event.

myExpander.Collapsed += new RoutedEventHandler(expanderHasCollapsed);            

<Expander Name ="myExpander" Collapsed="expanderHasCollapsed" 
          Header ="expanderTitle" Content="expanderContent"/>

The following example shows how to define the event handler.

private void expanderHasCollapsed(object sender, RoutedEventArgs args)
    //Do something when the Expander control collapses

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.