Add dynamic icons markers to visualization area chart

[Andy]

Using the image chart API you can add dynamic icons as described here:
http://code.google.com/apis/chart/image/docs/gallery/dynamic_icons.html

Is it possible to do similar using the visualization area chart?

e.g. if I have an area chart plotting quantity sold on the y-axis and
dates on the x-axis, I might want to mark the date that an advertising
campaign started to highlight any effect on sales.

Is it possible to place additional markers on a visualization api area
chart?

[asgallant]

No, there is no way to do this in the API.  You can add that kind of information to the tooltips, but it's not quite the same.  You can try overlaying an image on top of the chart, too, but the positioning can be tricky.