WPF ListBox - 获取UIElement而不是SelectedItem

private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ListBox listBox = sender as ListBox;
    if (listBox != null)
    {
        foreach (var item in listBox.SelectedItems)
        {
            var listBoxItem = listBox.ItemContainerGenerator.ContainerFromItem(item) as ListBoxItem;
            if (listBoxItem != null)
            {
                var uiElement = FindVisualChild<UIElement>(listBoxItem);
                // 在这里使用UIElement
            }
        }
    }
}

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;
}