/// <summary>
/// The collapse all button click.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The e.
/// </param>
private void CollapseAllButtonClick(object sender, RoutedEventArgs e)
{
foreach (TreeViewItem node in VisualTreeHelperHelper.FindVisualChildren <TreeViewItem>(this.Folders))
{
node.IsExpanded = false;
}
}
public static IEnumerable <T> FindVisualChildren <T>(DependencyObject depObj) where T : DependencyObject
{
if (depObj != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
T item = child as T;
if (item != null)
{
yield return(item);
}
foreach (T childOfChild in VisualTreeHelperHelper.FindVisualChildren <T>(child))
{
yield return(childOfChild);
}
}
}
}
