Layers groups on/off - Enhanced Map Switcher v2.4

[RobertMyers]

Can the Enhance Map Switcher v2.4 widget http://www.arcgis.com/home/item.html?id=c720fb45e752402d978c2fdbe4259746 be modify so that instead of the map services loading and unloading, a certain group of layers are turned on and off from different map services that stay load?

The idea would be that different map services are loaded and certain layers make up say a Utility Map "theme" but you could switch to another group of layers making up a Zoning Map "theme".  The idea being that some layers from the other group layers could still be turn on individually to add to each map theme if needed. In a way...like the ArcIMS Layers on/off  app http://help.arcgis.com/en/webapi/flex/samples/01nq/01nq0000005q000000.htm

Thanks you,

B