private void sendPropertyChange(object sender, EventArgs e)
        {
            PropertyOptProgressionEventArgs ea = new PropertyOptProgressionEventArgs();

            ea.Index       = Index;
            ea.IndexStepTo = numStepTo.Value ?? -1;
            ea.Description = txtDescription.Text;
            PropertyChanged(this, ea);
        }
        private void BtnDelete_Click(object sender, RoutedEventArgs e)
        {
            PropertyOptProgressionEventArgs ea = new PropertyOptProgressionEventArgs();

            ea.Index       = Index;
            ea.IndexStepTo = IndexStepTo;
            ea.ToDelete    = true;
            PropertyChanged(this, ea);
        }