Am I misunderstanding documentation or is this a simulator bug? getSubscreen

Hi,

Was trying to find the location of the little wheel for semioctagon screens and thought that an ideal candidate for doing this would be:

https://developer.garmin.com/connect-iq/api-docs/Toybox/WatchUi.html#getSubscreen-instance_function

But when I try to test (yes, testing for a semioctagon device), it won't compile.

EG: I include the line:

System.println("DRAW FEATURE "+WatchUi.getSubscreen());

And I see the console output:

ERROR: instinct2: E:\gdcsoft\SVN_GARMIN\WatchFace_RomanNumerals\source\WFView.mc:218: Undefined symbol "getSubscreen" detected.

AFAIK, I am on the most current SDK - 4.0.9 - so this looks a lot like a bug... or do I need to do something else?

Bemused of Dublin