text: window = ix.api.GuiWindow(ix.application, 0, 0, 640, 480)
  label = ix.api.GuiLabel(window, 0, 0, 640, 480, "Hello World")
  label.set_justification(ix.api.GuiWidget.JUSTIFY_CENTER)
  window.show()
  while window.is_shown(): ix.application.check_for_events()