 selectedItem label icon src valueattr">
<template>

  <link rel="stylesheet" href="core-submenu.css">

  <core-item id="submenuItem" src="{{src}}" label="{{label}}" icon="{{icon}}" class="{{ {'core-selected' : active} | tokenList}}" on-tap="{{activate}}">
    <content select=".item-content"></content>
  </core-item>

  <core-menu id="submenu" selected="{{selected}}" selectedItem="{{selectedItem}}" valueattr="{{valueattr}}">
    <content></content>
  </core-menu>

  <core-collapse target="{{$.submenu}}" ope