It looks as if you are correct, it doesn't seem to be available in CS6 for me either, what does work is to send a JavaScript Call via COM, maybe you could use that?
ps.ApplicationClass app = new ps.ApplicationClass();
String RC = app.DoJavaScript("app.togglePalettes();", null, null);
ps.ApplicationClass app = new ps.ApplicationClass();
String RC = app.DoJavaScript("app.togglePalettes();", null, null);