i>
                    <span class="menu-title-text">Instances</span>
                </button>
            </li>
            <li role="presentation" id="designUnitsTab" >
                <button id="design-units-tab" onclick="viewTab('#design-units')" role="tab" aria-controls="design-units" data-toggle="tab">
                    <i class="fa fa-th" aria-hidden="true"></i>
                    <span class="menu-title-text">Design Units</span>
                </button>
            </li>

        </ul>
       