title: how i can prevent reload sub folder of same parent FuelUX Tree
body: <pre><code>var DataSourceTree = function (options) {
                  this.url = options.url;
              }
              DataSourceTree.prototype = {
                  data: function (options, callback) {
                      var self = this;
                      var $data = null;
                      var param = null
                      if (!("name" in options) &amp;&amp; !("type" in options)) {
                          param = 0; //load the first level  
                      } else if ("type" in options &amp;&amp; options.type == "folder") {
                          if ("additionalParameters" in options &amp;&amp; "children" in options.additionalParameters) {
                              param = options.additionalParameters["id"];
                          }
                      }
                      if (param != null) {
                          $.ajax({
                              url: this.url,
                              data: 'id=' + param,
                              type: 'POST',
                              dataType: 'json',
                              success: function (response) {
                                  callback(response)
                              },
                              error: function (response) {
                                  console.log(response);
                              }
                          })
                      }
                  }
              };
              $('#tree2').admin_tree({
                  dataSource: new DataSourceTree({ url: 'AccountTree.ashx' }),
                  loadingHTML: '&lt;div class="tree-loading"&gt;&lt;i class="fa fa-spinner fa-2x fa-spin"&gt;&lt;/i&gt;&lt;/div&gt;',
                  'open-icon': 'fa-folder-open',
                  'close-icon': 'fa-folder',
                  'selectable': false,
                  'multiSelect': false,
                  'selected-icon': null,
                  'unselected-icon': null
              });
  </code></pre>
  
  <p>this JSON data i revived from AccountTree.ashx
  {\"data\":[{\"id\":1,\"name\":\"label 1\",\"type\":\"folder\",\"additionalParameters\":{\"id\":1,\"children\":true,\"itemSelected\":false,\"name\":\"test\",\"type\":\"item\"}}]}</p>
  
  <p>i know there is something wrong in callback(response) </p>
  
  <p><a href="http://i.stack.imgur.com/6DEtr.png" rel="nofollow">http://i.stack.imgur.com/6DEtr.png</a></p>
  
  <p>must be label1 --> item</p>