content: sub init()
      ? "[correct_screen] init"
      m.result = m.top.findNode("result")
      m.env = m.top.FindNode("correct_env")
          m.top.observeField("visible", "onVisibleChange")
      m.result.buttons = ["NEXT"]
  end sub
  
  sub onVisibleChange()
      if m.top.visible = true then
          m.result.setFocus(true)
      end if
  end sub