GWT & Visualisations API - ImageLineGraph display options

Hi

I'm displaying a ImageLineChart via my little GWT application and I
just wanted to add some display options, namely:

chm=s,000000,0,1,7.5

Which is just a little black square node on series 1 (0) point number
2(1). I tried appending the above string onto one of my current
ImageLineChart url's and hey presto, there appeared the black node.
In the GWT application I used:

options.set("chm", "s,000000,0,1,7.5");

As I couldn't find an actual method for setting "chm", so I tried a
general-purpose set() method, as above. This doesn't seem to be
working and checking the URL in debug I can't find any mention of this
chm parameter which I thought I'd have set.

Can anyone see where I've gone wrong or suggest a way of setting such
a parameter?

Many Thanks in advance

Tony

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