[Matplotlib-users] "mpl_toolkits.axisartist.floating_axes.FloatingSubplot" required option

Dear matplotlibers,

I know almost nothing about mpl_toolkits (matplolib.__version__ = 1.1.0).
>From the help of
"mpl_toolkits.axisartist.floating_axes.FloatingSubplot", the init
function reads
__init__(self, fig, *args, **kwargs)

In the example here
(http://matplotlib.sourceforge.net/examples/axes_grid/demo_floating_axes.html)
the object is initialised as
 FloatingSubplot(fig, rect, grid_helper=grid_helper)

If I take out 'grid_helper' I get this error:
"ValueError: FloatingAxes requires grid_helper argument"

In my understanding, **kwargs (like grid_helper) are optional
arguments and I think that 'required' options do not make much sense.
Besides its not documented in the help of the class.

Could grid_helper be upgraded to *args?

Cheers,
Francesco