Avoiding Groovy/Grails internals while debugging in IntelliJ Idea

Question

I'm using IntelliJ Idea 8.1.2 for Grails development. The dynamic nature of Groovy is giving me a hard time debugging my code: I keep ending up in the internals of Groovy/Grails, i.e. CachedMethod, ExpandoMetaClass or the like.

Is there a way for example to tell the Idea debugger to completely skip the Groovy/Grails internals while debugging and only make steps in my own code? I did notice that there is a configuration option named "Do not step into specific Groovy classes" in Debugger > Groovy but so far I've noticed no difference.

If not, what is your workaround or how do you cope with the situation? Any help would be greatly appreciated.