TreeViewItem.Expanded Event

public:
 event System::Windows::RoutedEventHandler ^ Expanded;

public event System.Windows.RoutedEventHandler Expanded;

member this.Expanded : System.Windows.RoutedEventHandler 

Public Custom Event Expanded As RoutedEventHandler 

Event Type

Examples

The following example shows how to assign an event handler for the Expanded event to a TreeViewItem and how to define the event handler in the code-behind.

<TreeViewItem Header="Employee1"
 Name="Employee1Data" 
 IsExpanded="True" 
 Collapsed="OnCollapsed" 
 Expanded="OnExpanded">
 <TreeViewItem Header="Work Days" 
 Name="EmployeeWorkDays"
 IsSelected="True">
 <TreeViewItem Header="Tuesday" />
 <TreeViewItem Header="Friday"/>
 </TreeViewItem>
</TreeViewItem>
<TreeViewItem Header="Employee2" 
 Name="Employee2Data">
 <TreeViewItem Header="Work Days" 
 Name="emp2WorkDays" 
 Selected="GetSchedule"
 Unselected="SetSchedule">
 <TreeViewItem Header="Monday" />
 <TreeViewItem Header="Wednesday"/>
 </TreeViewItem>
</TreeViewItem>

private void OnExpanded(object sender, RoutedEventArgs e)
{
 //Perform actions when the TreeViewItem is expanded
}

Private Sub OnExpanded(ByVal sender As Object, ByVal e As RoutedEventArgs)
 'Perform actions when the TreeViewItem is expanded
End Sub

Remarks

This event occurs when a TreeViewItem is expanded so that its child elements are visible.

Routed Event Information

See also

• IsExpanded
• Collapsed