Need help to find origin of a memory leakage

[David Tremouilles]

hello,

 I'm struggling with a memory leakage of my  app for quite some
time. Could somebody help?

I join a demo program in attachment.
The problem is that the memory consumption keeps on increasing while
opening and closing tabs.
In the demo attached a click on "button" will open a new tab. If, for
example, you open ten new tabs, then close ten tabs, and open again
ten tab, and repeat this many times you will see the memory
consumption increases after each 10 close-10 open cycles.
Could somebody help me on finding the origin of this leak?

Note: I already post on pygtk list and did not get any useful help at
this point in time.
I use
Python 2.5.1
GTK: (2, 12, 0)
 pyGTK: (2, 12, 0)
I already observed the same issue with older versions...
It's been a long time I try to solve it...

Thanks in advance,
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