HTML Items in Charts

[rcoon]

A recent podcast from BSP (http://www.bspsoftware.com/Support/PodcastChannel/tabid/228/Default.aspx?episode=2.13?episode=2.13) showed adding HTML Items to certain columns of a List to create links or trigger actions.  Pretty neat.  I was wondering if the same thing was possible from a Cognos Chart, where you could create a specific link for each bar/line/slice.  Unlike the List, it is not clear where in a Chart you could add these HTML Items.  Has anyone done this?  Is it possible?

What I would really like is to define a custom tooltip that would appear when you hover over a particular bar in a bar chart. I have something similar working for a column in a List, using jQuery to display a second List (or even a whole report) in the tooltip.

Thanks,
rob