public class CustomPaintRichText : RichTextBox, IUnderlineableSpellingControl
    {
        public Dictionary<int, int> underlinedSections;
        public Dictionary<int, int> protectedSections;
        public Dictionary<int, int> ignoredSections;
        public Dictionary<int, int> UnderlinedSections
        {
            get
            {
                if (underlinedSections == null)
                    underlinedSections = new Dictionary<int, int>();
                return underlinedSections;
            }
            set { underlinedSections = value; }
        }

        public Dictionary<int, int> ProtectedSections
        {
            set { protectedSections = value; }
        }

        public Dictionary<int, int> IgnoredSections
        {
            set { ignoredSections = value; }
        }

        private bool spellingEnabled;
        private bool spellingAutoEnabled;
        private bool isPassWordProtected;

        private Pen penColour;
        public Pen WhatPenColour
        {
            get { return penColour; }
            set { penColour = value; }
        }

        public bool IsSpellingEnabled
        {
            get { return spellingEnabled; }
            set { spellingEnabled = value; }
        }

        public bool IsSpellingAutoEnabled
        {
            get { return spellingAutoEnabled; }
            set
            {
                spellingAutoEnabled = value;
                if (!spellingEnabled) spellingEnabled = value;
            }
        }

        public bool IsPassWordProtected
        {
            get { return isPassWordProtected; }
            set { isPassWordProtected = value; }
        }
    }