在WPF中，如何滚动到FlowDocumentScrollViewer的底部？

ScrollViewer scrollViewer = FindVisualChild<ScrollViewer>(flowDocumentScrollViewer);

scrollViewer.ScrollToVerticalOffset(scrollViewer.ScrollableHeight);

private static T FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
{
    int childCount = VisualTreeHelper.GetChildrenCount(parent);
    for (int i = 0; i < childCount; i++)
    {
        var child = VisualTreeHelper.GetChild(parent, i);
        if (child is T typedChild)
        {
            return typedChild;
        }
        else
        {
            T result = FindVisualChild<T>(child);
            if (result != null)
                return result;
        }
    }
    return null;
}