What I wrong ?

var obj = new AW.UI.Group;
    obj.setId("G1");
    obj.setControlSize(300, 150);
    obj.setControlText("Group/Fieldset");
    obj.setControlImage("favorites");
    obj.setStyle("border", "2px solid red");
    
        var objL = new AW.UI.Label;
        objL.setControlText("Label");
        //objL.setControlImage("favorites");
 
        var txtN = new AW.UI.Input;
        //txtN.setId("objTxtN");
        txtN.setName("objTxtN");
        txtN.setSize(180,20);
        txtN.setControlText("Please,Input Your name.");
        //txtN.refresh();

        var xxx = objL+" : "+txtN;
        
    //obj.setContent("object", txtN);
    //obj.refresh();
    obj.setContent("object", xxx);
    obj.refresh();
    //document.write(obj);