Job control process not killed when closing window

[https://me.yahoo.com/postrockrob#52e3a]

Closing the window (or tab) that contains a running job should prompt with a dialog to kill the running process. Currently, the process continues and brings up an error:

Traceback (most recent call last):
  File "/opt/lib/python2.5/site-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 14614, in <lambda>
    lambda event: event.callable(*event.args, **event.kw) )
  File "/data2/home/rob/src/peppy/peppy/sidebar.py", line 180, in finishedCallback
    self.finishCallback(job)
  File "z:\src\peppy\peppy\jobcontrol.py", line 266, in deregisterProcess
AttributeError: process

Reproduce by opening a second frame, starting the interpreter using Tools -> Run, and then closing the frame that is running the interpreter.

[https://me.yahoo.com/postrockrob#52e3a]

But, should it? Is the process attached to the document or the window? Should any other tabs containing the same document also show that the process is running?