private bool IsValidationErorr(FrameworkElement el)
        {
            bool _value = false;

            if (el != null)
            {
                foreach (object child in LogicalTreeHelper.GetChildren(el))
                {
                    FrameworkElement elm = child as FrameworkElement;
                    if (elm != null)
                    {
                        if (Validation.GetHasError(elm))
                        {
                            _value = true;
                        }
                    }
                    if (IsValidationErorr(elm))
                    {
                        _value = true;
                    }
                }
            }

            return _value;
        }