EDIT: This issue can be disregarded. Initially, I could not find the support for up/down ListSpinners which seemed to exist in past JavaFX 2.2 versions of Jfxtras.
However, after closer examination of the current Jfxtras APIs, I found the support that I was seeking in the ListSpinnerSkin class.
I assume you have found how to do it, but just in case some one has the same question: it is done through CSS: -fxx-arrow-position and -fxx-arrow-direction
EDIT: This issue can be disregarded. Initially, I could not find the support for up/down ListSpinners which seemed to exist in past JavaFX 2.2 versions of Jfxtras.
However, after closer examination of the current Jfxtras APIs, I found the support that I was seeking in the ListSpinnerSkin class.