content: 
  sub Init()
      m.top.backgroundUri= "pkg:/images/customOverlay.jpg"
      m.screenLoader = m.top.FindNode("screenLoader") 
      InitScreenStack()
      ShowGridScreen()
      RunContentTask() 
  
  end sub
  
  function OnkeyEvent(key as String, press as Boolean) as Boolean
      result = false
      if press
          if key = "back"
              numberOfScreens = m.screenStack.Count()
              if numberOfScreens > 1
                  CloseScreen(invalid)
                  result = true
              end if
          end if
      end if
      return result
  end function
  