Cannot edit style for datapoint in charting control

Sep 6, 2010 at 10:15 AM

When trying to modify the style of a datapoint in a chart I'm getting an exception:

"Specified index is already in use. Disconnect the visual child at the specified index first."

This happens when I'm trying to modify the style in Blend. I also get this exception when trying to modify the LegendItemStyle.

Why is that?

Thanks for help!