ticklabels positions not updated

Hi all,
I'm going crazy with ticklabels positions, I just want to update yticklabels
but nothing changes :

tlist=gca().get_yticklabels()
tlist[1].get_position()

              Out [571]:(0.0, 1.0)

tlist[1].set_position((0.0, 2.0))
draw()
tlist[1].get_position()

              Out [574]:(0.0, 1.0)
Do I miss something?
Thanks

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Lionel Roubeyrie - lroubeyrie@...1068...
Chargé d'études et de maintenance
LIMAIR - la Surveillance de l'Air en Limousin
http://www.limair.asso.fr