// can probably be merged with next variant
static void disposeWindow(final Window window) {
  if (window != null) swing {
    window.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING)); // call listeners
    window.dispose();
  }
}

static void disposeWindow(final Component c) {
  disposeWindow(getWindow(c));
}

static void disposeWindow(O o) {
  if (o != null) disposeWindow((Component) o);
}