@Override
 public String toString() {
   String returned = super.toString() + "\n";
   for (Enumeration<FlexoModelObject> en = _selection.elements(); en.hasMoreElements(); ) {
     FlexoModelObject o = en.nextElement();
     StringTokenizer st = new StringTokenizer(o.getClass().getName(), ".");
     String className = "";
     while (st.hasMoreTokens()) {
       className = st.nextToken();
     }
     returned += "> " + className + ":" + o + "\n";
   }
   return returned;
 }