title: Polymer how to set default value on paper select
body: <p>I am using a paper-select element where I want to set some default value on DOM ready or based on some event fire.</p>
  
  <pre><code> &lt;dom-module id="paper-selects"&gt;
  &lt;template&gt;
       &lt;paper-select id="select-input-1" 
         multiple 
         label-field="name"
         bind-value="{{dataBind}}"
         on-input-changed="interestsChanged"
         nonmatching on-adding-item="addItem" select-on-blur 
         label="Select your favorite programming language"
         placeholder="please select your item"
         value="df"
         autofocus
       &gt;
       &lt;/paper-select&gt;
  &lt;/template&gt;
  </code></pre>
  
  <p></p>