designer

designer.html

<link rel="import" href="../core-icon-button/core-icon-button.html">
<link rel="import" href="../core-toolbar/core-toolbar.html">
<link rel="import" href="../core-scroll-header-panel/core-scroll-header-panel.html">

<polymer-element name="my-element">

  <template>
    <style>    
      :host {
        position: absolute;
        width: 100%;
        height: 100%;
        box-sizing: border-box;
      }
      #core_scroll_header_panel {
        left: 0px;
        bottom: 0px;
        top: 0px;
        right: 0px;
        position: absolute;
      }
      #core_toolbar {
        color: rgb(241, 241, 241);
        fill: rgb(241, 241, 241);
        background-color: rgb(255, 204, 170);
      }
      #section, #threshold {
        height: 5000px;
        background: linear-gradient(rgb(214, 227, 231), rgb(173, 216, 230));
      }
    </style>
    <core-scroll-header-panel headermargin="42" condenses keepcondensedheader headerheight="192" condensedheaderheight="150" id="core_scroll_header_panel">
      <core-toolbar id="core_toolbar" class="tall">
        
      </core-toolbar>
      <section id="section" content>
        <core-scroll-threshold id="threshold" lowerthreshold="500" on-lower-trigger="{{ loadMore }}" lowertriggered>
				</core-scroll-threshold>
      </section>
    </core-scroll-header-panel>
  </template>

  <script>

    Polymer({
      loadMore: function () {
  				Window.alert("yeah");
			}
    });

  </script>

</polymer-element>