[gtkmm] Is this a memory leak?

[Adam Olsen <adamolsen net-bizz com>]

I've been noticing that Gtk::FileSelection doesn't give back all the 
memory when it's destroyed in my application.  Here is a small testcase 
I have come up with.  If you just keep hitting cancel or ok the memory 
useage just keeps going up.  memprof reports it as a leak.

http://www.rafb.net/efnet_cpp/paste/results/hO817965.html

What am I doing wrong?  Is there some basic C++ fundamental I'm missing 
here?

Thanks,

Adam Olsen