<td>
                      <div class="btn-group-vertical">
                        <button type="button" class="btn btn-success">1</button>
                        <button type="button" class="btn btn-success">2</button>

                        <div class="btn-group">
                          <button type="button" class="btn btn-success dropdown-toggle" data-toggle="dropdown">
                          </button>
                          <ul class="dropdown-menu">
                            <li><a class