Can't lock left and right on SegmentedControl?

Has anyone found a workaround for Feedback case 20563, where a SegmentedControl doesn’t resize when you lock its left and right? It also won’t accept changes to its Width during a window resize, so I’m kind of stuck. And this has been around for 2 years… sigh

Norman’s answer at the the bottom of this conversation in the old forum may help.

I can make that work, thank you!