How to include plot grid?

[Terry Duell]

Hullo All,
I'm running Octave 3.6.1 on Fedora 16.
I am having trouble getting a grid included on my 2D plots.
The following code plots the data OK....
figure(1);
grid("on");
plot(m);

but neither the default plotting nor 'fltk' will add a grid.
When using 'fltk' the 'toggle grid' button is does nothing, but works OK  
when plotting 3D.
Is this behaviour a bug, or is there something else I need to do to get a  
grid on a 2D plot?

Cheers,
--
Regards,
Terry Duell