Ubuntu :: Workplace Switcher Works Better Under Ambiance Or Radiance?

I've attached 2 jpeg screenshots. Look at the center of the top panel and you'll find my Workplace Switcher. In the Ambiance screenshot, the Workplace Switcher clearly shows that Google Voice is open in the 2nd workspace because it shows that icon there. In the Custom screenshot, the Workplace Switcher shows there's a window open in the second workspace, but no icon to identify what's in the window. I've checked all available controls, and only Ambiance and Radiance correctly show icons for most open windows in the Workplace Switcher. Does anyone know how to make controls from other themes work with Workplace Switcher the way that Ambiance and Radiance do?