PointerUpDownStageAction typedef
        PointerUpDownStageAction =
     PickingInfo Function(num unTranslatedPointerX, num unTranslatedPointerY, PickingInfo pickResult, PointerEvent evt)
    
    
    
Implementation
typedef PointerUpDownStageAction = PickingInfo Function(num unTranslatedPointerX, num unTranslatedPointerY, PickingInfo pickResult, PointerEvent evt);