/// <summary>
        /// Hide the colored line
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void OnGlyphMouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
        {
            TextTagger tagger = TextTagger.GetTagger(_textView);

            if (tagger != null)
            {
                tagger.RemoveLineRestriction();
            }
        }
        /// <summary>
        /// Shows the line colors
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void OnGlyphMouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
        {
            IWpfTextViewLine line   = (IWpfTextViewLine)((System.Windows.Shapes.Ellipse)sender).Tag;
            TextTagger       tagger = TextTagger.GetTagger(_textView);

            if (tagger != null)
            {
                tagger.ShowForLine(line);
            }
        }