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RadTreeViewExpanded Event
Occurs when a child TreeView item has been expanded.

Namespace: Telerik.Windows.Controls
Assembly: Telerik.Windows.Controls.Navigation (in Telerik.Windows.Controls.Navigation.dll) Version: 2018.1.220.40 (2018.1.220.40)
public event EventHandler<RadRoutedEventArgs> Expanded


Type: SystemEventHandlerRadRoutedEventArgs
Following code fragment shows the basic usage.
void RadTreeView1_Expanded(object sender, RadRoutedEventArgs e)
    // get a reference to the item that has been expanded
    RadTreeViewItem expandedItem = e.Source as RadTreeViewItem;

    // get a reference to the RadTreeView
    RadTreeView treeView = (sender as RadTreeView);
See Also