private void IzmenaSirovine(object sender, RoutedEventArgs e)
 {
     if (dgSirovine.SelectedItem != null)
     {
         WinAESirovina waes = new WinAESirovina(lstSirovina.ToList());
         waes.Owner       = this;
         waes.DataContext = dgSirovine.SelectedItem;
         waes.ShowDialog();
     }
 }
        private void DodavanjeSirovine(object sender, RoutedEventArgs e)
        {
            WinAESirovina waes = new WinAESirovina(lstSirovina.ToList());

            waes.Owner = this;
            if (waes.ShowDialog() == true)
            {
                lstSirovina.Add(waes.DataContext as clsSirovina);
            }
        }