             _placeHolderGroup.mxmlContent = value;
         else
             _mxmlContent = value;
+        
+        if (value != null)
+            _contentModified = true;
     }
     
     //----------------------------------

     */
    public function removeElementAt(index:int):IVisualElement
    {
        return currentContentGroup.removeElementAt(index);
    }
    

     */
    public function addElement(element:IVisualElement):IVisualElement
    {
        _contentModified = true;
        return currentContentGroup.addElement(element);
    }
    
