programatically show NSSegmentedCell menu?

FROM : Jesse Grosjean
DATE : Thu Mar 27 21:21:44 2008

I'm trying to programatically show a NSSgetmentedCell menu, as if the 
user has clicked on that segmented cell. For normal popup buttons you 
can do this with 'performClick:', but that doesn't work for segmented 
controls, because it will always just perform the click on the middle 
cell. Is there a way to do a "targeted" performClick on a 
NSSegmentedControl? That's targeted to a specific cell?

Thanks,
Jesse