getActiveTab not working after loadXML

Here is my XML:

<?xml version="1.0"?>



    

        Screen Manager

        Profile Manager

        User Manager

        NavBar Manager

        VBA Manager

    





Here is my JavaScript:

    var tabbar=new dhtmlXTabBar(“a_tabbar”,“top”);

    tabbar.setImagePath("<c:out value=’${pageContext.request.contextPath}’/>/dhtmlx/dhtmlxTabbar/codebase/imgs/");

        

    tabbar.setOnSelectHandler(tabChanged);

    tabbar.setOnTabContentLoaded(tabChanged);

    tabbar.loadXML("<c:out value=’${pageContext.request.contextPath}’/>/layouts/management.xml");

        

    tabbar.setCustomStyle(“Screen”,"#F0F8FF","#f2f0e6",“tabStyleScreen”);

tabbar.setCustomStyle(“Profile”,"#F0F8FF","#f2f0e6",“tabStyleProfile”);

tabbar.setCustomStyle(“User”,"#F0F8FF","#f2f0e6",“tabStyleUser”);

tabbar.setCustomStyle(“NavBar”,"#F0F8FF","#f2f0e6",“tabStyleNavBar”);

tabbar.setCustomStyle(“VBA”,"#F0F8FF","#f2f0e6",“tabStyleVBA”);



setCurrentGrid(tabbar.getActiveTab()); // <- getActiveTab returns null;

        

The loading is async, so in moment when js command called the tab is not available yet.
The correct code will be

    tabbar.loadXML("<c:out value=’${pageContext.request.contextPath}’/>/layouts/management.xml",function(){
        setCurrentGrid(tabbar.getActiveTab()); // <- getActiveTab returns null;

    });