Create custom item in jsTree Context menu

I create a treeview using jsTree with contextmenu in asp.net mvc3.

<div id="divtree">
<ul id="tree">
    <li><a href="#" class="usr">@Model.Name</a>
        @Html.Partial("Childrens", Model)
    </li>
</ul>

<script type="text/javascript">
$(function () {
    $("#divtree").jstree(
        {
            "plugins": ["themes", "html_data", "ui", "crrm", "contextmenu"]
        });
});

it's works fine.

I want to create a custom item in the context menu. For example create a new menu item. New for create new Employee in the context menu, and insert the employee in DB. I use a jQuery POST function for this task. But how to handle the click event in the Context menu item.