A .NET Wizard control

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
using System.Diagnostics;
using UtilityLibrary.General;
using UtilityLibrary.Win32;


namespace UtilityLibrary.WinControls
{
  // <summary>
  /// Summary description for TextBoxEx.
  /// </summary>
  
  [ToolboxItem(true)]
  [ToolboxBitmap(typeof(UtilityLibrary.WinControls.TextBoxEx), "UtilityLibrary.WinControls.TextBoxEx.bmp")]
  public class TextBoxEx : System.Windows.Forms.TextBox
  {
    #region Class Variables
    DrawState drawState = DrawState.Normal;
    #endregion

    #region Constructors
    public TextBoxEx()
    {
      // Make sure we have the 3D look setting which is the one
      // we are going to paint over
      BorderStyle = BorderStyle.Fixed3D;
    }

    #endregion

    #region Overrides
    protected override void OnMouseEnter(EventArgs e)
    {
      // Set state to hot
      base.OnMouseEnter(e);
      drawState = DrawState.Hot;
      Invalidate();
    }

    protected override void OnMouseLeave(EventArgs e)
    {
      // Set state to Normal
      base.OnMouseLeave(e);
      if ( !ContainsFocus )
      {
        drawState = DrawState.Normal;
        Invalidate();
      }
    }
      
    protected override void OnGotFocus(EventArgs e)
    {
      // Set state to Hot
      base.OnGotFocus(e);
      drawState = DrawState.Hot;
      Invalidate();
    }
        
    protected override void OnLostFocus(EventArgs e)
    {
      // Set state to Normal
      base.OnLostFocus(e);
      drawState = DrawState.Normal;
      Invalidate();
    }

    protected override  void WndProc(ref Message m)
    {
      bool callBase = true;
            
      switch(m.Msg)
      {
        case ((int)Msg.WM_PAINT):
        {
          // Let the edit control do its painting
          base.WndProc(ref m);
          // Now do our custom painting
          DrawTextBoxState(Enabled?drawState:DrawState.Disable);
          callBase = false;
        }
          break;
        default:
          break;
      }

      if ( callBase )
        base.WndProc(ref m);
    
    }

    #endregion
    
    #region Properties
    public new BorderStyle BorderStyle 
    {
      // Don't let the user change this property
      // because we are counting on the extra pixels
      // than the 3D look adds to the edit control size
      // to do our painting
      get { return base.BorderStyle; } 
      set 
      {
        if ( value != BorderStyle.Fixed3D )
        {
          // Throw an exception to tell the user
          // that this property needs to be Fixe3D if 
          // he is to use this class
          string message = "BorderStyle can only be Fixed3D for this class";
          ArgumentException argumentException = new ArgumentException("BorderStyle", message);
          throw(argumentException);
        }
        else 
          base.BorderStyle = value;
      }
    }
    
    #endregion

    #region Implementation
    void DrawTextBoxState(DrawState drawState)
    {
      // Get window area
      Win32.RECT rc = new Win32.RECT();
      WindowsAPI.GetWindowRect(Handle, ref rc);
      // Convert to Rectangle
      Rectangle rect = new Rectangle(0, 0, rc.right - rc.left, rc.bottom - rc.top);

      // Create DC for the whole edit window instead of just for the client area
      IntPtr hDC = WindowsAPI.GetWindowDC(Handle);
      
      using (Graphics g = Graphics.FromHdc(hDC))
      {
        // This rectangle is always drawn for any state
        using ( Pen windowPen = new Pen(SystemBrushes.Window) )
        {
          g.DrawRectangle(windowPen, rect.Left+1, rect.Top+1, rect.Width-3, rect.Height-3);
        }
        
        if ( drawState == DrawState.Normal )
        {
          // draw SystemColos.Window rectangle
          using ( Pen windowPen = new Pen(SystemBrushes.Window) )
          {
            g.DrawRectangle(windowPen, rect.Left, rect.Top, rect.Width-1, rect.Height-1);
          }
        }
        else if ( drawState == DrawState.Hot )
        {
          // draw highlighted rectangle
          g.DrawRectangle(SystemPens.Highlight, rect.Left, rect.Top, rect.Width-1, rect.Height-1);
        }
        else if ( drawState == DrawState.Disable )
        {
          // draw highlighted rectangle
          g.FillRectangle(SystemBrushes.Control, rect);
          Size textSize = TextUtil.GetTextSize(g, Text, Font);
          Point point = new Point(rect.Left+1, rect.Top + (rect.Height - textSize.Height)/2);
          if ( PasswordChar !=  0)
          {
            int length = Text.Length;
            string currentText = new String(PasswordChar, length);
            g.DrawString(currentText, Font, SystemBrushes.ControlDark, point); 
          }
          else
            g.DrawString(Text, Font, SystemBrushes.ControlDark, point); 
        }
      }

      // Release DC
      WindowsAPI.ReleaseDC(Handle, hDC);
            
    }

    #endregion

  }
}