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

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

     */
    public function removeAllElements():void
    {
        _contentModified = true;
        currentContentGroup.removeAllElements();
    }
    
