using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace ColoredTextBox
{
    public partial class ColoredTextBox : TextBox
    {
        public ColoredTextBox()
        {
            InitializeComponent();
            this.Multiline = true;
            this.Width = 50;
            this.Height = 50;
            this.WordWrap = false;
            this.ScrollBars = ScrollBars.Both;
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            Pen blackPen = new Pen(Color.Black, 3);
            Rectangle rectangle1 = new Rectangle(0, 0, 20, 10);
            e.Graphics.DrawRectangle(blackPen, rectangle1);
            MessageBox.Show("Paint!");
            base.OnPaint(e);
        }
    }
}

[FlagsAttribute] 
public enum ControlStyles