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RadTreeViewCollapsed Event
Occurs when a child TreeView item has been collapsed.

Namespace: Telerik.Windows.Controls
Assembly: Telerik.Windows.Controls.Navigation (in Telerik.Windows.Controls.Navigation.dll) Version: 2017.3.1018.40 (2017.3.1018.40)
Syntax
public event EventHandler<RadRoutedEventArgs> Collapsed

Value

Type: SystemEventHandlerRadRoutedEventArgs
Examples
Following code fragment shows the basic usage.
void RadTreeView1_Collapsed(object sender, RadRoutedEventArgs e)
{
    // get a reference to the item that has been collapsed
    RadTreeViewItem collapsedItem = e.Source as RadTreeViewItem;

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