JS:
define([
    "dojo/_base/declare",
    "dojo/_base/lang",
    "dojo/dom-class",
    "dijit/registry",
    "dijit/layout/ContentPane"
    ], function(declare,
    lang,
    domClass,
    registry,
    ContentPane
    ) {

    var Menu = declare("freeadmin.Menu", [], {
        constructor: function(/*Object*/ kwArgs){
            lang.mixin(this, kwArgs);
        },
        openSystem: function(tab) {
            var opened = false;
            var p = registry.byId("content");

            var c = p.getChildren();
            for(var i=0; i<c.length; i++){
              if(c[i].tab == 'system'){
                p.selectChild(c[i]);
                opened = c[i];
                if(tab) {
                    var tabnet = registry.byId("tab_systemsettings");
                    if(tabnet) {
                        var c2 = tabnet.getChildren();
                        for(var j=0; j<c2.length; j++){
                            if(c2[j].domNode.getAttribute("tab") == tab)
                                tabnet.selectChild(c2[j]);
                        }
                    }
                } else {
                    c[i].refresh();
                }
              } else {
                p.removeChild(c[i]);
                c[i].destroy();
              }
            }

            if(opened == false) {
                openurl = this.urlSystem;
                if(tab) {
                    openurl += '?tab='+tab;
                }
                var pane = new ContentPane({
                    title: gettext('System'),
                    closable: false,
                    href: openurl
                });
                pane.tab = 'system';
                p.addChild(pane);
                p.selectChild(pane);
            }

        },



























HTML:

<div data-dojo-type="dijit.MenuBar" id="navMenu">
  {% if user.is_authenticated %}

  <div id="menuBar_Account" data-dojo-type="dijit.MenuBarItem" onClick="Menu.openAccount();" class="menu_icon">
    <img src="{{ STATIC_URL }}images/ui/menu/account.png" />
    <br />
    <span>{% trans "Account" %}</span>
  </div>