Add Transparency Slider to a Layer

[NeilMillward]

I am trying to add a Transparency Slider to a layer in my layer list but I cannot find any information on how to do this in the concepts. Is this something that is easy to do?

Thanks

[RobertScheitlin__GISP]

Pedro,

    The swipe and Spotlight widget is now available for the Flex Viewer 2.x

http://www.arcgis.com/home/item.html?id=b9767b3f300142488c798953a94906fc