pylab and gtk : the main windows close !

I have a problem :

I wrote a little GUI with glade, python and pygtk.
This GUI produce one or many figures to plot results, depend on what the user click.
To plot a new figure, I use from pylab import * an figure().
My GUI is a one windows GUI.

The problem is :
when 1 figure + the main window is open and I close this figure, the main window also close !

But when 2 (or more figure) + the main window are open when I close a figure, it close only this figure, non problem.

When my main scipt is run with the ipython console with 'run' , it works.
But with 'python', it doesn't work.

What is trick ?




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