[vtkusers] vtkOrientationMarkerWidget: how to modify the color of the x y z labels?

[Jean-Do Barnichon]

Hi,

the vtkOrientationMarkerWidget shows an orientation marker with 3 axes 
labelled x y z.

The question is simple:
is it possible to modify the color of the x y z labels (white by 
default), or at least
to show these labels using a shadowed font?

Thanks,
J-D