!7

static JScrollPane scroller;

p-substance {
  showFrame(scroller = new JScrollPane);
  scroller.setViewportView(vstack(jbutton("1"), jbutton("2"), jbutton("3")));
  packFrame(scroller);
  awtLater(scroller, 5000, r {
    scroller.setViewportView(vstack(jbutton("7"), jbutton("2"), jbutton("4"), jbutton("6"), jbutton("hello!")));
  });
}