private void Button_Click(object sender, RoutedEventArgs e)
        {
            MasterPasswordTextBox.Background       = DefaultCtrlBkgBrush;
            MasterPasswordVerifyTextBox.Background = DefaultCtrlBkgBrush;

            if (MasterPasswordTextBox.Password.Trim() != MasterPasswordVerifyTextBox.Password.Trim())
            {
                MasterPasswordVerifyTextBox.Background = new SolidColorBrush(Colors.DarkRed);
                return;
            }
            var tmp = MasterPasswordTextBox.Password;

            MasterPasswordTextBox.Password = "";
            if (string.IsNullOrEmpty(tmp) || tmp.Contains(" ") || tmp.Trim().Length < 6 || tmp.Trim().Length > 16)
            {
                MasterPasswordTextBox.Background = new SolidColorBrush(Colors.DarkRed);
                return;
            }

            mpwdh = AppHelpers.CreateHash(tmp);

            Close();
        }