Well, good news, bad news.�� I AM able to set breakpoints wherever I want in Pharo (repo) code... and in many cases the breakpoint works and the debugger pops up.�� However, I must have stumbled across (perhaps the only) one that blows up when I run my app.�� See screenshot.�� To be clear, I've had no issue extending Pharo repo classes (into my own packages).�� Besides the bold red text stating the repos are missing in��Iceberg :) this is the only error I've come across.�� I have not spent a lot of time poking around to see which classes allow breakpoints and which don't.�� Initially I feared none of the breakpoints would work, but when I removed the breakpoint on SpSingleSelectionMode - the next breakpoint (in Pharo repo) did fire and brought up the debugger.
I've since worked around my problem (thanks Esteban!) and the breakpoint on SpSingleSelectionMode is no longer required :)
Thanks!
Russ