Javascript Fancytree不可见，隐藏了类ui帮助程序

我刚刚开始使用fancytree 2.6.0，我正在通过web服务请求填充它

我的问题是，所有节点都存在，但ui帮助程序隐藏类使其不可见。我已经临时修复了：$（rootNode.ul）.removeClass（'ui-helper-hidden'）；但我肯定我错过了什么

脚本和css：

<link href="Scripts/jquery-plugins/fancytree-2.6.0/src/skin-themeroller/ui.fancytree.css" rel="stylesheet" type="text/css" />
<script src="Scripts/jquery-1.11.1/jquery-1.11.1.js" type="text/javascript"></script>
<script src="Scripts/jquery-1.11.1/jquery-migrate-1.2.1.js" type="text/javascript"></script>
<script src="Scripts/jquery-ui-1.11.2/jquery-ui.js" type="text/javascript"></script>
<script src="Scripts/jquery-plugins/fancytree-2.6.0/src/jquery.fancytree.js" type="text/javascript"> </script>
<script src="Scripts/jquery-plugins/fancytree-2.6.0/src/jquery.fancytree.themeroller.js" type="text/javascript"> </script>

生成的html：

<div class="grid_13 alpha omega" id="selectedClausesDiv">
    <ul class="ui-fancytree fancytree-container ui-fancytree-source ui-helper-hidden" tabindex="0">
        <li class="">
            <span class="fancytree-node fancytree-folder fancytree-exp-n fancytree-ico-cf">
                <span class="fancytree-expander"/>
                <span class="fancytree-icon"/>
                <span title="This folder and all child nodes were added programmatically." class="fancytree-title">P&amp;I Owned</span>
            </span>
        </li>
        <li class="fancytree-lastsib">
            <span class="fancytree-node fancytree-folder fancytree-lastsib fancytree-exp-nl fancytree-ico-cf">
                <span class="fancytree-expander"/>
                <span class="fancytree-icon"/>
                <span title="This folder and all child nodes were added programmatically." class="fancytree-title">P&amp;I Extended Cargo</span>
            </span>
        </li>
    </ul>
</div>

宝洁；我拥有


宝洁；我延期交货

如果没有提供数据源，Fancytree将自动隐藏根元素

如果使用API添加数据而没有初始源，则提供空白的

source

选项将防止Fancytree隐藏根元素

$("#tree").fancytree({
    source: []
});

$("#tree").fancytree({
    source: []
});