Polymer 1.x: Modal paper-dialog appears behind its backdrop -

does have advice fixing problem of modal appearing behind backdrop?

so far, have tried making sure have necessary imports (including <paper-dialog-scrollable>).

i tried "hack-fix" (suggested someone) involving setting z-index: auto in css of paper-header-panel. neither works.

it's worth noting <paper-dialog> tag works fine. until add modal attribute.

any ideas?

similar issues

appearing around internet this issue report , this stackoverflow question.

my-element.html

<script src="http://www.polymer-project.org/1.0/samples/components/webcomponentsjs/webcomponents-lite.js"></script> <link rel="import" href="http://www.polymer-project.org/1.0/samples/components/polymer/polymer.html" /> <link rel="import" href="../../../bower_components/paper-dialog/paper-dialog.html">  <dom-module id="example-element">   <template>     <!-- dialog -->     <paper-dialog id="contactdialog" modal>       <h2>login</h2>       <paper-dialog-scrollable>         <form id="contact-form" autofocus>           <paper-input autofocus id="name" label="your name"></paper-input>           <paper-input id="email" label="email address"></paper-input>         </form>       </paper-dialog-scrollable>       <div class="buttons">         <paper-button dialog-dismiss>cancel</paper-button>         <paper-button dialog-confirm>accept</paper-button>       </div>     </paper-dialog>     <!-- button -->     <paper-button id="login"                   data-dialog="contactdialog"                   on-tap="opendialog">login</paper-button>   </template> </dom-module> <script>   (function() {     polymer({       is: 'example-element',       properties: {...},       opendialog: function(){         this.$.contactdialog.open();       }     });   })(); </script> 

this solution:

opendialog: function(){   var body = document.queryselector('body');   polymer.dom(body).appendchild(this.$.dialogid);   this.$.dialogid.open(); }