/// <summary>
/// Add the specified hierarchy element.
/// </summary>
/// <param name="element">The hierarchy element to add.</param>
private void AddHierarchyElement(DocumentRange element)
{
if (_lastHierarchyElement == null)
{
_page.AddContent(element);
}
else
{
_lastHierarchyElement.AddElement(element);
}
_lastHierarchyElement = element;
}