content: ' sub init()
  '     m.top.enableRenderTracking = true
  '     m.top.observeField("renderTracking", "renderTracker")
  ' end sub
  
  ' sub renderTracker(evt as object)
  '     renderTrack = evt.getData()
  '     if renderTrack = "full"
  '         onScreenEnter()
  '     end if
  ' end sub
  
  ' Override on each screen
  sub onScreenEnter()
  end sub
  