content: function GetBaseMediator()
      if (m._gameBaseMediator = invalid)
          prototype = EventDispatcher()
          prototype.eventTypes = GetEventType()
  
          prototype._backToMainMenuHandled = function()
              m.dispatchEvent(m.eventTypes.ON_BACK_TO_MAIN_MENU)
          end function    
  
          m._gameBaseMediator = prototype
      end if
      
      return m._gameBaseMediator
  end function
  
  function onBackToMainMenuHandled()
      m._gameBaseMediator._backToMainMenuHandled()
  end function    