private void btDelete_Click(object sender, RoutedEventArgs e)
{
if (tb_LastTransactionInfo.IsSelected)
{
l.Delete();
}
else if (tb_FixedTransactionAttrib.IsSelected)
{
fta.Delete();
}
else if (tb_TransactionReference.IsSelected)
{
tr.Delete();
}
else if (tb_ControlledTransaction.IsSelected)
{
ct.Delete();
}
}