Make VisualVM show line numbers

I'm using VisualVM to profile a Scala program that has been compiled with the default of -g:vars, which includes line numbers (verified with javap that the class files have line numbers). However, VisualVM isn't showing any line numbers in any of its profiling, only method names. Is there any way to make it show files and line numbers? Using VisualVM 1.3.2 (and if it matters: Sun JDK 6 and Scala 2.9.0.1).