GTk backend problem

Hello,
I recently upgraded to Enthought python 2.6 an so I have now matplotlib 0.99.3
My scripts now no longer seem to find the pyGTK since when I run them I got this message:

Traceback (most recent call last):
   File "./sed_plotb_v2.py", line 14, in <module>
     from pylab import *
   File "/Library/Frameworks/Python.framework/Versions/6.2/lib/python2.6/site-packages/pylab.py", line 1, in <module>
     from matplotlib.pylab import *
   File "/Library/Frameworks/Python.framework/Versions/6.2/lib/python2.6/site-packages/matplotlib/pylab.py", line 247, in <module>
     from matplotlib.pyplot import *
   File "/Library/Frameworks/Python.framework/Versions/6.2/lib/python2.6/site-packages/matplotlib/pyplot.py", line 78, in <module>
     new_figure_manager, draw_if_interactive, show = pylab_setup()
   File "/Library/Frameworks/Python.framework/Versions/6.2/lib/python2.6/site-packages/matplotlib/backends/__init__.py", line 25, in pylab_setup
     globals(),locals(),[backend_name])
   File "/Library/Frameworks/Python.framework/Versions/6.2/lib/python2.6/site-packages/matplotlib/backends/backend_gtkagg.py", line 10, in <module>
     from matplotlib.backends.backend_gtk import gtk, FigureManagerGTK, FigureCanvasGTK,\
   File "/Library/Frameworks/Python.framework/Versions/6.2/lib/python2.6/site-packages/matplotlib/backends/backend_gtk.py", line 11, in <module>
     raise ImportError("Gtk* backend requires pygtk to be installed.")
ImportError: Gtk* backend requires pygtk to be installed.

is any way to help matplotlib to point the where pyGTK is or go around the problem with another backend?

Thanks,
Nino

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Antonino Cucchiara, PhD
Postdoctoral Scholar
Lawrence Berkeley National Lab
UC Berkeley
website: www.astro.psu.edu/~cucchiara/