How to hilight python multiline comment from custom syntax hilight radsyntaxeditor

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Telerik.Windows.Controls;

using Telerik.WinForms.Controls.SyntaxEditor.Taggers;
using Telerik.WinForms.SyntaxEditor.Core.Tagging;
using Telerik.WinControls.UI;
using Telerik.WinForms.Controls.SyntaxEditor.UI;
using System.IO;

namespace WindowsFormsApp12
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public class PythonTagger : WordTaggerBase
        {
            private static readonly string[] Keywords = new string[]
    {
        "False", "None", "True", "and", "as", "assert","break", "class",
        "continue", "def", "del", "elif", "else", "except", "for", "from",
        "global", "if", "import", "in", "is", "lambda", "nonlocal", "not",
        "or", "pass", "raise", "finally", "return", "try", "while", "with", "yield"
    };

            private static readonly string[] Comments = new string[]
    {
        "#"
    };

            private static readonly string[] Operators = new string[]
    {
        "+", "-",  "*", "/"
    };

            public static readonly ClassificationType FruitsClassificationType = new ClassificationType("Fruits");

            private static readonly string[] Fruits = new string[]
    {
        "apple", "banana",  "cherry"
    };

            private static readonly Dictionary<string, ClassificationType> WordsToClassificationType = new Dictionary<string, ClassificationType>();

            static PythonTagger()
            {
                WordsToClassificationType = new Dictionary<string, ClassificationType>();

                foreach (var keyword in Keywords)
                {
                    WordsToClassificationType.Add(keyword, ClassificationTypes.Keyword);
                }

                foreach (var preprocessor in Operators)
                {
                    WordsToClassificationType.Add(preprocessor, ClassificationTypes.Operator);
                }

                foreach (var comment in Comments)
                {
                    WordsToClassificationType.Add(comment, ClassificationTypes.Comment);
                }

                foreach (var comment in Fruits)
                {
                    WordsToClassificationType.Add(comment, FruitsClassificationType);
                }
            }

            public PythonTagger(RadSyntaxEditorElement editor)
                : base(editor)
            {
            }

            protected override Dictionary<string, ClassificationType> GetWordsToClassificationTypes()
            {
                return PythonTagger.WordsToClassificationType;
            }

            protected override bool TryGetClassificationType(string word, out ClassificationType classificationType)
            {
                int number;

                if (int.TryParse(word, out number))
                {
                    classificationType = ClassificationTypes.NumberLiteral;
                    return true;
                }

                return base.TryGetClassificationType(word, out classificationType);
            }
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            PythonTagger pythonTagger = new PythonTagger(this.radSyntaxEditor1.SyntaxEditorElement);
            if (!this.radSyntaxEditor1.TaggersRegistry.IsTaggerRegistered(pythonTagger))
            {
                this.radSyntaxEditor1.TaggersRegistry.RegisterTagger(pythonTagger);
            }

            this.radSyntaxEditor1.TextFormatDefinitions.AddLast(ClassificationTypes.NumberLiteral, new TextFormatDefinition(new SolidBrush(Color.Red)));
            this.radSyntaxEditor1.TextFormatDefinitions.AddLast(ClassificationTypes.Operator, new TextFormatDefinition(new SolidBrush(Color.YellowGreen)));
            this.radSyntaxEditor1.TextFormatDefinitions.AddLast(PythonTagger.FruitsClassificationType, new TextFormatDefinition(new SolidBrush(Color.LightCoral)));


            StreamReader  reader = new StreamReader(@"C:\Python27amd64\Lib\msilib\text.py");
            {
                radSyntaxEditor1.Document = new     Telerik.WinForms.SyntaxEditor.Core.Text.TextDocument(reader);
            }


        }

        private void radMenuItem2_Click(object sender, EventArgs e)
        {
            StreamReader reader = new StreamReader(@"C:\Python27amd64\Lib\ctypes\util.py");
            {
                radSyntaxEditor1.Document = new Telerik.WinForms.SyntaxEditor.Core.Text.TextDocument(reader);
            }

        }

        private void radSyntaxEditor1_Click(object sender, EventArgs e)
        {

        }
    }
}