public override IRange Add()
        {
            OpenXmlSdk.Run openXmlRun = new OpenXmlSdk.Run();
            _paragraph.InnerObject.Append(openXmlRun);

            OpenXmlSdkRange range = new OpenXmlSdkRange(_paragraph, openXmlRun);

            if (range != null)
            {
                Add(range);
            }

            return range;
        }
 internal OpenXmlSdkTextCollection(OpenXmlSdkRange range)
 {
     _range = range;
 }