I believe the style you're looking for is selectionColor.
Thanks for the suggestion.
selectionColor is "Background color of the LinkButton control as you press it".
I'm looking for the backgroundColor of the link in its selected state after the mouseOut.
IOW, the equivalent of textSelectedColor but for the backgroundColor of the selectedItem, just like the ToggleButtonBar acts.
I'm not 100% certain, but I believe the core problem is that the default Spark mx:LinkButton skin doesn't toggle or have a background fill for the selectedUp, selectedOver, selectedDown, or selectedDisabled states. I haven't tried with an mx:LinkBar yet, but you can create a toggleable mx:LinkButton control by creating a custom skin: http://blog.flexexamples.com/2010/02/04/creating-a-toggleable-mx-linkbutton-control-in-fle x-4/.
If I get some time tomorrow, I can try looking at the Spark mx:LinkBar skin and see if there is an easy tweak for that too.
Peter, that'd be really great, thanks.