wpf 查找DataTemplate中的控件的实现方式

private childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(obj, i);
                if (child != null && child is childItem)
                    return (childItem)child;
                else
                {
                    childItem childOfChild = FindVisualChild<childItem>(child);
                    if (childOfChild != null)
                        return childOfChild;
                }
            }
            return null;
        }

ListBox lbCurrent = e.Source as ListBox;
                    foreach (object o in lbCurrent.Items)
                    {
                        ListBoxItem lbi = lbCurrent.ItemContainerGenerator.ContainerFromItem(o) as ListBoxItem;
                        ContentPresenter myContentPresenter = FindVisualChild<ContentPresenter>(lbi);
                        DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;
                        ToggleButton tbhaha = myDataTemplate.FindName("tbContainer", myContentPresenter) as ToggleButton;
                        tbhaha.IsChecked = false;
                    }
                    tb.IsChecked = true;