ected="name" selected="{{mainPage}}" class="flex" style="width: auto;">
              <designer-tab name="designer">
                <button>Designer</button>
              </designer-tab>
            </designer-tabs>
            <div class="gridPanel horizontal layout center">
              <label>Show grid</label>
              <paper-toggle-button id="gridToggle" on-change="_onGridToggle"></paper-toggle-button>
            </div>
          </div>
          <iron-pages class="flex" selected="[[mainPage]]"