plot2d - lines and points ???



This is my first post to Maxima mailing list.
First of all, I want to express my respect and gratitude to all Maxima 
developers and contributors.

1. I was working in Windows 2000, Maxima 5.9.12 and wxMaxima (great 
environment!!!) exploring Maxima help.
When reproducing Interpolate Examples (Contents=>interpol) the command

plot2d([f(x),[discrete,p]],[x,0,10],
          [gnuplot_curve_styles,
                ["with lines","with points pointsize 3"]])$

will not give LINE for f(x) and POINTS for list of data pairs p but TWO 
LINES (no points).
When I put the command say (explained in Contents=>Plotting)

plot2d([f(x),[discrete,p]],[x,0,10], [style, 
[lines,1,1],[points,5,3,6]],[legend,"line","points"]);

I will get as expected (line and points). I might miss something 
concerning Maxima and gnuplot.
Moreover, I could not figure out how to plot lines and points on the 
same plot using Plot2d... from within wxMaxima.
I do not know what to put under "Options" in "Plot2d..."

plot2d([f(x)], [x,0,10],
[plot_format, gnuplot],
[gnuplot_preamble, ...])$       ???what could  I put here after 
gnuplot_preamble???

Regards