How to display a method's "Ruby Stack Path"

I am trying to learn the Ruby behind Rails and it would be helpful to be able to find the Ruby code for a given method. For example I am in Script/console and I do: "puts ActiveRecord.methods". I get a nice list. Lets say I want to explore the mattr_accessor method. Is there a command or method that would give me the Stack Trace to that piece of Ruby code? I am using Windows Grep to find it now and that doesn't usually work as many of the methods are added via class_eval from somewhere far far away.

it turns up in: C:\ruby\lib\ruby\gems\1.8\gems\activesupport-2.0.2\lib\active_support \core_ext\module\attribute_accessors.rb

Typing in some Ruby Magic like ActiveRecord.mattr_accessor.ruby_path would be really cool. But, I suppose the methods added by "included" callbacks are going to be invisible... Tell me it isn't so!

Thanks in advance