TreeViewItem.Expanded Event
Definition
Important
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Occurs when the IsExpanded property changes from false
to true
.
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
Identifier field | ExpandedEvent |
Routing strategy | Bubbling |
Delegate | RoutedEventHandler |
Applies to
See also
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