Collapsed Event
Collapse the table of content
Expand the table of content

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

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

Identifier field


Routing strategy




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
Available since 3.0
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