submenu>
              <paper-submenu label="Methods">
                <paper-item class="menu-trigger">Methods</paper-item>
                <paper-menu class="menu-content sublist2">
                  <paper-item>open()</paper-item>
                  <paper-item>close()</paper-item>
                  <paper-item>toggle()</paper-item>
                </paper-menu>
            </paper-submenu>
          </paper-menu>
        </paper-submenu>

          <paper-submenu label="Unavailable" disabled>
           