I have four data series I would like to visualize using a bubble chart.
(x, y, r, p)
x: x axis position
y: y axis position
r: bubble size
p: probability (preferrable shown as pie sector angle)

How can I replace the bubbles in the pie chart by little pie charts each
representing two values (site and sector angle)? I could not find any
corresponding atrribute in the object model.