private Run SplitRun(Run run, int position)

 {

            Run beforeRun = (Run)run.Clone(true);

            beforeRun.Text = run.Text.Substring(0, position);

            beforeRun.Font.Underline = Underline.Single;

            run.Text = run.Text.Substring(position);

            run.ParentNode.InsertBefore(beforeRun, run);

            return run;

  }