private void lbSubUnit_MouseDoubleClick(object sender, MouseButtonEventArgs e)
 {
     if (lbSubUnit.SelectedItem != null)
     {
         SubUnit s = addSubUnit.getEditedSubUnit(lbSubUnit.SelectedItem as SubUnit);
         if (s != null)
         {
             if (sqlWorker.updateSubUnit(s))
             {
                 sList.update(s);
                 lbSubUnit.Items.Refresh();
             }
             else
             {
                 MessageBox.Show("Ошибка при изменении элемента");
             }
         }
     }
 }