private void runButtonActionPerformed(
     java.awt.event.ActionEvent evt) { // GEN-FIRST:event_runButtonActionPerformed
   Substance[] substances = new Substance[selectedSubstanceNames.getSize()];
   for (int i = 0; i < substances.length; i++)
     substances[i] = (Substance) (system.get((String) (selectedSubstanceNames.get(i))));
   rss.start();
 } // GEN-LAST:event_runButtonActionPerformed
 public void setUpList() {
   List substances = system.getSubstances();
   int nSubs = substances.size(); // substances.length;
   Substance s;
   for (int i = 0; i < nSubs; i++) {
     s = (Substance) (substances.get(i));
     substanceNames.addElement(s.getName());
   }
 }