    <paper-item name="no" icon="image:crop-din">No Groups</paper-item>
        </core-menu>
      </paper-dropdown>      
    </paper-menu-button>
    <paper-slider id="slider" min="150" max="400" step="50" value="{{size}}"></paper-slider>
  </core-toolbar>
  <core-scroll-threshold id="threshold" scrollTarget="{{$.scroller}}" 
    lowerThreshold="1500" on-lower-trigger="{{loadMore}}">
  </core-scroll-threshold>
  <div id="scroller" flex>
    <core-list id="list" data="{{data}}" groups="{{grouped==