private void _btn_modify_Click(object sender, RoutedEventArgs e)
{
string company_id = (sender as System.Windows.Controls.Button).Tag.ToString();
NewOrModifyCompany company = new NewOrModifyCompany(company_id, this);
company.ShowDialog();
}
private void _new_Click(object sender, RoutedEventArgs e)
{
NewOrModifyCompany company = new NewOrModifyCompany(this);
company.ShowDialog();
}