code: @Override
      public Object getE(int intKey) throws PageException {
  	Iterator it = valueIterator();// getMap().keySet().iterator();
  	int count = 0;
  	Object o;
  	while (it.hasNext()) {
  	    o = it.next();
  	    if ((++count) == intKey) {
  		return o;// super.get(o.toString());
  	    }
  	}
  	throw new ExpressionException("invalid index [" + intKey + "] for argument scope");
      }
docs: return a value matching to key
  
  @param intKey
  @return value matching key
  @throws PageException