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Well this recipe doesn't work.  if you can make it work or get something different that does work, PLEASE LET ME KNOW.  I got this code from a fellow on the CodeGuru website, but unfortunately I think that this is a bug with the .Net framework and there is simply no way to get this to work.

Here's what I've got so far:

using System;
using System.Windows.Forms;
using log4net;
 
namespace InternalInstantMessenger
{
      /// <summary>
      /// Just a small class to help determine if a control has focus
      /// Got the code from here: http://www.codeguru.com/forum/showthread.php?t=320529
      /// </summary>
      /// <remarks>I had to modify it a bit to get it to compile and to add logging but otherwise
      /// it's as provided on that site.
      /// It seems to me that Microsoft never tested this and that I'm the first person ever
      /// to try and use it.  None of the .Focused or .ContainsFocus work!  Even if I'm typing into the
      /// control it still returns false.
      /// </remarks>
      ///
      class FocusHelper
      {
            private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
            static public bool HasFocus(Control control)
            {
                  log.Debug("Checking State of Control: " + control.Name +" Is it focused? "+control.Focused.ToString());
                  if (control.Focused)
                  {
                        return true;
                  }
                  log.Debug("Checking State of Control: " + control.Name +" Is it focused? "+control.ContainsFocus.ToString());
                  if (control.ContainsFocus)
                  {
                        return true;
                  }
 
                  foreach (Control ctrl in control.Controls)
                  {
                        if (HasFocus(ctrl))
                        {
                             
                              return true;
                        }
                  }
 
                  return false;
            }
      }
}

When this is running the log file that it puts out looks like this:

21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: ConversationForm Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: ConversationForm Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: Input_Font_Button Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: Input_Font_Button Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: ParticipantsLabel Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: ParticipantsLabel Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: membersListView Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: membersListView Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: InviteOthersButton Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: InviteOthersButton Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: ConversationDisplayBox Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: ConversationDisplayBox Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: MessageInputBox Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: MessageInputBox Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: statusBar Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: statusBar Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: SendButton Is it focused? False 
21:51:59,859 [InternalInstantMessenger.FocusHelper.HasFocus(:0)] - Checking State of Control: SendButton Is it focused? False 

That's the log snippet from when I was typing into the 'MessageInputBox' RichTextBox when a new message from another machine arrived.  Everything is doubled because of the two lines of logging per control.  The first line for .Focused, the second is for .ContainsFocus.  I am really stumped on this one, it really seems like the focus code from Microsoft is broken badly.  Any help would be appreciated.