/// <summary>
 /// Creates a new FormattedTextRun.
 /// </summary>
 public FormattedTextRun(FormattedTextElement element, TextRunProperties properties)
 {
     if (element == null)
     {
         throw new ArgumentNullException("element");
     }
     if (properties == null)
     {
         throw new ArgumentNullException("properties");
     }
     this.properties = properties;
     this.element    = element;
 }
 public SpecialCharacterTextRun(FormattedTextElement element, TextRunProperties properties)
     : base(element, properties)
 {
 }