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-icons/core-icons.html">
<link rel="import" href="../paper-icon-button/paper-icon-button.html">
<link rel="import" href="../core-icon/core-icon.html">
<link rel="import" href="../core-menu/core-submenu.html">
<link rel="import" href="../core-item/core-item.html">

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

  <template>
    <style>    
      :host {
        position: absolute;
        width: 100%;
        height: 100%;
        box-sizing: border-box;
      }
      #core_toolbar {
        right: 0px;
        color: rgb(255, 255, 255);
        fill: rgb(255, 255, 255);
        background-color: rgb(79, 125, 201);
      }
      #core_menu {
        font-size: 16px;
        left: 1080px;
        top: 80px;
        position: absolute;
      }
    </style>
    <core-toolbar id="core_toolbar">
      <paper-icon-button icon="menu" id="paper_icon_button"></paper-icon-button>
      <core-icon icon="room" id="core_icon"></core-icon>
      <div id="div" flex>Toolbar</div>
      <paper-menu-button id="paper_menu_button">
        <paper-icon-button icon="more-vert" id="paper_icon_button1"></paper-icon-button>
      </paper-menu-button>
    </core-toolbar>
    <core-menu selected="0" selectedindex="0" activateevent="{{ tap }}" id="core_menu">
      <core-submenu opened active id="core_submenu" icon="settings" label="Topics">
        <core-item id="core_item" label="Topic 1" horizontal center layout></core-item>
        <core-item id="core_item1" label="Topic 2" horizontal center layout></core-item>
      </core-submenu>
      <core-submenu id="core_submenu1" icon="settings" label="Favorites">
        <core-item id="core_item2" label="Favorite 1" horizontal center layout></core-item>
        <core-item id="core_item3" label="Favorite 2" horizontal center layout></core-item>
        <core-item id="core_item4" label="Favorite 3" horizontal center layout></core-item>
      </core-submenu>
    </core-menu>
  </template>

  <script>

    Polymer({
      tap: 'tap'
    });

  </script>

</polymer-element>

good work, used in our project thanks.