public VertexInfoDialog(Vertex vertex) {
   v = vertex;
   setTitle("Vertex: " + v.getName());
   Container cp = getContentPane();
   JPanel p = new JPanel();
   p.setLayout(new GridLayout(1, 1));
   opis = new TextArea(v.getInfo());
   opis.setEditable(false);
   p.add(opis, new FlowLayout());
   cp.add(p);
   setSize(200, 300);
   setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 }
 public void refresh() {
   opis.setText(v.getInfo());
 }