windows phone richtextbox hyperlink remove underline

        private void AppendLink(string text, Uri uri)        {            Paragraph paragraph;            if (this.Blocks.Count == 0 ||                (paragraph = this.Blocks[this.Blocks.Count - 1] as Paragraph) == null)            {                paragraph = new Paragraph();                this.Blocks.Add(paragraph);            }            var run = new Run { Text = processHTMLEntity(text.Replace("<em>", "").Replace("</em>", "")) };                       run.Foreground = new SolidColorBrush(new Color() {A = 0xFF, R = 0x6a, G = 0x9b, B = 0xCD });             var link = new Hyperlink { NavigateUri = uri };            link.Inlines.Add(run);            link.TextDecorations = null;            link.Click += (sender, e) =>                {                    var lk = sender as Hyperlink;                    new Microsoft.Phone.Tasks.WebBrowserTask() { Uri = lk.NavigateUri }.Show();                };            paragraph.Inlines.Add(link);        }

link.TextDecorations = null; 即移除hyperlink的underline.