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RadTreeViewPreviewUnchecked Event
Occurs before a child TreeView item is unchecked.

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> PreviewUnchecked

Value

Type: SystemEventHandlerRadRoutedEventArgs
Examples
Following code fragment shows the basic usage.
void private void RadTreeView1_PreviewUnchecked(object sender, RadRoutedEventArgs e)
{
    // get a reference to the item that will be unchecked
    RadTreeViewItem itemToUncheck = e.Source as RadTreeViewItem;

    // if the action should be canceled set Handled property to true
    e.Handled = true;
}
See Also