private void button7_Click(object sender, RoutedEventArgs e)
{
if (_lastLine == null)
{
MessageBox.Show("No lines added", this.Title, MessageBoxButton.OK, MessageBoxImage.Warning);
return;
}
string report = _lastLine.ReportGeometry();
Clipboard.SetText(report);
MessageBox.Show(report, this.Title, MessageBoxButton.OK, MessageBoxImage.Information);
}