jQuery.contextMenu - wrapping submenu item in IE9

HTML

<link rel="stylesheet" href="http://medialize.github.com/jQuery-contextMenu/src/jquery.contextMenu.css">
<script src="http://medialize.github.com/jQuery-contextMenu/src/jquery.ui.position.js"></script>
<script src="http://medialize.github.com/jQuery-contextMenu/src/jquery.contextMenu.js"></script>
<div class="context-menu-one box menu-1">
    <strong>without title</strong>
</div>

CSS

/* menu header */
.css-title:before {
    content: "some title";
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    background: #DDD;
    padding: 2px;
    
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 11px;
    font-weight: bold;
}
.css-title :first-child {
    margin-top: 20px;
}


/* menu header via data attribute */
.data-title:before {
    content: attr(data-menutitle);
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    background: #DDD;
    padding: 2px;
    
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 11px;
    font-weight: bold;
}
.data-title :first-child {
    margin-top: 20px;
}


/* demo trigger boxes */
.box {
    color: #EEE;
    background: #666;
    font-weight: bold;
    padding: 20px;
    text-align: center;
    font-size: 20px;
    margin: 5px 0;
}
.box:hover {
    background: #777;
}
.box > * {
    display:block;
}
.menu-injected { background-color: #C87958; }
.box.context-menu-disabled { background-color: red; }

JavaScript

$(function(){
    $.contextMenu({
        selector: '.context-menu-one', 
        callback: function(key, options) {
            var m = "clicked: " + key;
            window.console && console.log(m) || alert(m); 
        },
        items: {
            "edit": {name: "Edit", icon: "edit"},
            "cut": {name: "Cut", icon: "cut"},
            "copy": {name: "Copy This to the Clipboard Please", icon: "copy"},
            "paste": {name: "Paste", icon: "paste"},
            "delete": {name: "Delete", icon: "delete"},
            "submenu": { name : "Submenu",
                         items : {
                             "submenu_item1" : {
                                 // NOTE: this is the item that wraps in IE9 but not in Firefox
                                 name : "Change Reporting Interval"
                             },
                             "submenu_item2" : {
                                 name : "Item 2"
                             }
                         }
            },
            "quit": {name: "Quit", icon: "quit"}
        }
    });
});