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Odd error with mlab and lighting - TVTK

Is there a time delay to the lighting manager being instantiated when a figure is set up?

In ipython the following lines work fine

fig = mlab.figure(browser=False)
fig.renwin.light_manager.lights[0].move_to(0,-45)


But this doesn't

fig = mlab.figure(browser=False);fig.renwin.light_manager.lights[0].move_to(0,-45)

In the noninteractive mode (i.e. running a script as opposed to typing in commands in the shell) even the first version does not work. I tried inserting a delay (time.sleep()) but that does not help


l = light_manager.CameraLight(fig.renwin)
l.move_to(0,-45)
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