//itemsControl 開始為指定的TreeView控件  item為TreeView子元素

private void PareItems(ItemsControl itemsControl, T  item)
{
TreeViewItem container = itemsControl.ItemContainerGenerator.ContainerFromItem(item) as TreeViewItem;

if (container != null)
{
container.IsExpanded = true;

if (container.ItemContainerGenerator.Status != System.Windows.Controls.Primitives.GeneratorStatus.ContainersGenerated)
{
container.UpdateLayout();
}
if ((container.Header as  T).Children != null)
{
foreach (var it in (container.Header as  T).Children)
{
PareItems(container, it);
}
}

if ((container.Header as T) ==TT)    //TT要找的子元素
{

container.IsSelected = true;
container.BringIntoView();//滾動條滾動到選中的子元素
}

itemsControl = container;
}
}