title: JSTree, Add child node is not working
body: <p>I am using JSTree for the first time, trying to add a child node to an existing node but it is not working so far.
  I know this topic have been discussed many times but I tried a lot of suggestions and still doesn't work out.</p>
  
  <p>here is a piece of code </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$('#jstree_div').jstree();
  var ElemSelected=$("#jstree_div").jstree(true).get_selected(true);
  var position = 'inside';
  var childNode = { state: "open", data: "Child Node" };
  
  $('#jstree_div').jstree("create_node", ElemSelected, position, newNode, false, false);</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id='jstree_div'&gt;
    &lt;ul&gt;
       &lt;li id='racine' data-jstree={'opened':true,'selected':true}&gt;
         &lt;a id='j2_6_anchor' class='jstree-clicked' href='#'&gt;&lt;/a&gt;
       &lt;/li&gt;
    &lt;/ul&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I don't know what I am missing, I will be greatfull if you can help me with this problem </p>