SimpleSpinnerArrowPositionsProperty    
    open class SimpleSpinnerArrowPositionsProperty(initialValue: SpinnerArrowPositions, bean: Any? = null, beanName: String? = null) : SimpleProperty<SpinnerArrowPositions> , SpinnerArrowPositionsProperty
Boilerplate which avoids having to use generics. Instead of SimpleProperty<SpinnerArrowPositions>, we can use SimpleSpinnerArrowPositionsProperty.