private void lbxSIN_SelectedValueChanged(object sender, EventArgs e)
{
SINForm sinForm = new SINForm(administration, lbxSIN.SelectedItem as SIN);
sinForm.Show();
}
private void btNewSIN_Click(object sender, EventArgs e)
{
SINForm sinForm = new SINForm(administration, null);
sinForm.Show();
}