BackSpace problum with IE Toolbar...?

For Handling backspace IE toolbar Band object I need to include following thing:

Here tstxt_Name and tstxt_Password is my TextBox..



public IEToolbarEngine () 
{ 
         Assembly asm = Assembly.GetExecutingAssembly (); 
         string fullName = asm.GetModules () [0].FullyQualifiedName;
         toolbarFolder = Path.GetDirectoryName (fullName);
         dataFolder = DataFolder;

        try
         { 
                cacheFolder = Path.Combine (dataFolder, "Cache"); 
               Directory.CreateDirectory (cacheFolder); 
         }
        catch (Exception){}

         try
        {
           rssFoldr = Path.Combine (cacheFolder, "RSS");
           Directory.CreateDirectory (rssFolder);
        } 
      catch (Exception){}

       InitializeComponent ();
       toolStripLabel1.Size = new System.Drawing.Size(150, 21);
       tstxt_Name.GotFocus += new EventHandler(tstxt_Name_GotFocus);
      tstxt_Name.Focus();

      tstxt_Password.GotFocus += new EventHandler(tstxt_Password_GotFocus);
      tstxt_Password.Focus(); 
}


private void tstxt_Password_GotFocus(object sender, EventArgs e)
{ 
      this.OnGotFocus(e);
}

private void tstxt_Name_GotFocus(object sender, EventArgs e)
{
      this.OnGotFocus(e);
}

public override int TranslateAcceleratorIO(ref MSG msg)
{ 
       TranslateMessage(ref msg);
       DispatchMessage(ref msg);
       return 0;
}


Njoy buddy..:)