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third_party/polymer/components/iron-overlay-behavior/test/test-menu-button.html

 <!--
 @license
 Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
 <link rel="import" href="../../polymer/polymer.html">
 <link rel="import" href="test-overlay.html">
 
 <dom-module id="test-menu-button">
 
   <template>
     <button id="trigger" on-click="toggle">Open</button>
-    <test-overlay id="dropdown">
-      <content></content>
+    <test-overlay id="overlay">
+      Composed overlay
+      <button>button 1</button>
+      <button>button 2</button>
     </test-overlay>
   </template>
 
 </dom-module>
 
 <script>
 
 (function() {
   Polymer({
     is: 'test-menu-button',
     toggle: function() {
-      this.$.dropdown.toggle();
+      this.$.overlay.toggle();
     }
   });
 })();
 
 </script>