private void OnNewRoleClick(object sender, RoutedEventArgs e)
        {
            var newRoleWnd = new NewRoleWindow {
                DataContext = _db
            };

            newRoleWnd.ShowDialog();
        }
        private void OnNewRoleClick(object sender, RoutedEventArgs e)
        {
            var newRoleWnd = new NewRoleWindow { DataContext = _db };

            newRoleWnd.ShowDialog();
        }