         {
             group = titleGroup;
             index = TITLE_GROUP_PROPERTIES_INDEX;
-            
-            // use titleContent if provided
-            defaultContent = (titleDisplay is IVisualElement)
-                ? [titleDisplay] : null;
         }
         else if (instance == actionGroup)
         {

    {
        if (titleGroup)
        {
            if (value)
            {
                titleGroup.mxmlContent = value;
            }
            else
            {
                titleGroup.mxmlContent = (titleDisplay is IVisualElement) 
                    ? [titleDisplay] : null;
            }
            
            contentGroupProperties[TITLE_GROUP_PROPERTIES_INDEX] = 
                BitFlagUtil.update(contentGroupProperties[TITLE_GROUP_PROPERTIES_INDEX] as uint,
                    CONTENT_PROPERTY_FLAG, value != null);

    {
        super.partAdded(partName, instance);
        
        var group:Group;
        var index:int = -1;
        
