Setting InteractorStyleTerrain does nothing in Jupyter

I want to keep Z axis up. In [1] I've found
`from tvtk.api import tvtk`
`fig = mlab.gcf()`
`fig.scene.interactor.interactor_style = tvtk.InteractorStyleTerrain()`
does that.

This code works as expected in a cell in Jupyter (opens new mayavi window):
`%gui qt`
`from mayavi import mlab`
`from tvtk.api import tvtk`
`fig = mlab.gcf()`
`fig.scene.interactor.interactor_style = tvtk.InteractorStyleTerrain()`
`mlab.test_barchart()`

This code doesn't:
`from mayavi import mlab`
`mlab.init_notebook()`
`from tvtk.api import tvtk`
`fig = mlab.gcf()`
`fig.scene.interactor.interactor_style = tvtk.InteractorStyleTerrain()`
`mlab.test_barchart()`

It shows the barchart in the notebook, but still allows me to turn it upside down.

[1] https://stackoverflow.com/questions/14225512/constrain-mayavi-mouse-drag-to-rotating-earth-around-its-axis