              selected="[[categoryData.category]]"
              attr-for-selected="name"
              on-iron-activate="_drawerSelected">
            <template is="dom-repeat" items="[[articles]]">
              <a name="[[item.name]]" href="#/[[item.name]]/list">{{item.title}}</a>
            </template>
          </iron-selector>

        </app-header-layout>
      </app-drawer>

      <!-- main panel -->
      <app-header-layout>

        <app-header fixed effects="waterfall" class="main-header" slot="