visualization API and Shape Markers Option

Hi to all,
i want to use Shape markers described in this
http://code.google.com/intl/it-IT/apis/chart/image/docs/gallery/line_charts.html#gcharts_background_fills
I can't succeed to use Options class to set the property chm to use
markers like arrow,

USAGE
chm=

[@]<marker_type>,<color>,<series_index>,<opt_which_points>,<size>,<opt_z_order>,<opt_offset>

I tryed this code

LineChart.Options options = LineChart.Options.create();
options.setWidth(800);
options.setHeight(540);
options.setTitle("PREM");
options.set("chm", "c,FF0000,0,1.0,20.0");
return options;

It doesn't works. Can anyone help me?

thaks

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