static JProgressBar showProgressWindow(double maxValue) {
  ret showProgressWindow(null, maxValue);
}

static JProgressBar showProgressWindow(S text, double maxValue) {
  JProgressBar bar = jProgressBarWithText(iround(maxValue));
  swingCall(bar, 'setString, text);
  centerFrame(packFrameVertically(500, showFrame(text, bar)));
  ret bar;
}