/// <summary>
/// Called when [execute collapse all].
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="args">The <see cref="System.Windows.Input.ExecutedRoutedEventArgs"/> instance containing the event data.</param>
private static void OnExecuteCollapseAll(object sender, ExecutedRoutedEventArgs args)
{
SfTreeGrid treeGrid = args.Source as SfTreeGrid;
treeGrid.CollapseAllNodes();
}
