private void BtnAdd_Click(object sender, RoutedEventArgs e)
        {
            Window window = new Windows.WindowAddEditEmploee();

            window.ShowDialog();
        }
        private void BtnEdit_Click(object sender, RoutedEventArgs e)
        {
            Window window = new Windows.WindowAddEditEmploee(DGEmployers.SelectedItem as Entities.Employee);

            window.ShowDialog();
        }