Как сменить картинки на TDBNavigator?

procedure ChangeDBNavImage(DBnav: TDbNavigator);
var
  i: Integer;
  tempGlyph: TBitmap;
  ExePath: string;
begin
  ExePath := ExtractFilePath(Application.ExeName);
  tempGlyph := TBitmap.Create;
  try
    with DBNav do
    begin
      for i := 0 to ControlCount - 1 do
      begin
        if Controls[i].ClassName = 'TNavButton' then
        begin
          case TNavButton(Controls[i]).Index of
            nbFirst: tempGlyph.LoadFromFile(ExePath + 'first.bmp');
            nbPrior: tempGlyph.LoadFromFile(ExePath + 'previous.bmp');
            nbNext: tempGlyph.LoadFromFile(ExePath + 'Next.bmp');
            nbLast: tempGlyph.LoadFromFile(ExePath + 'Last.bmp');
            nbInsert: tempGlyph.LoadFromFile(ExePath + 'Insert.bmp');
            nbDelete: tempGlyph.LoadFromFile(ExePath + 'Delete.bmp');
            nbEdit: tempGlyph.LoadFromFile(ExePath + 'Edit.bmp');
            nbPost: tempGlyph.LoadFromFile(ExePath + 'Post.bmp');
            nbCancel: tempGlyph.LoadFromFile(ExePath + 'Cancel.bmp');
            nbRefresh: tempGlyph.LoadFromFile(ExePath + 'Refresh.bmp');
          end;
          TNavButton(Controls[i]).Glyph := tempGlyph;
        end;
      end;
    end;
  finally
    tempGlyph.Free;
  end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
  ChangeDBNavImage(DBNavigator1);
end;

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