public void valueChanged(ListSelectionEvent e) {
@SuppressWarnings("unchecked")
JList<String> sender = (JList<String>) e.getSource();
if (!sender.isSelectionEmpty()) {
if (sender.equals(boxList())) updateTubList(sender.getSelectedValue());
if (sender.equals(machineList())) selectedMachine = sender.getSelectedValue();
if (sender.equals(tubList())) selectedTub = sender.getSelectedValue();
}
assignButton().setEnabled(!tubList().isSelectionEmpty() && !machineList().isSelectionEmpty());
}
