Sometimes marker with a bigger RadiusMember value is overlapping marker with smaller RadiusMember value. Is it possible to setup XamDataChart so it will place bubble markers according to their radius's: bubbles with smaller radius on the foreground, bubbles with bigger radius's on the background? It tried to sort my data collection by RadiusMember but this doesn't help.
The data chart currently reuses markers in such a way that the z-indexing can become confused. This doesn't normally affect the appearance of the chart, but can become quite obvious with the Bubble series, with differing radii. I believe this is reported as a bug and should be resolved when the bubble series RTMs. I will try to locate the bug number for you.
-Graham