Hi,

Sorry to intrude into your request.I saw this sample code for line chart. I wanted to know whether we can drag primitives such as Box in a composite chart in a similar manner.

Regards,

Uday 

in the FillSceneGraph event handler, we loop through the primitives seeking Polylines, then loop through the DataPoints in each Polyline, hit testing each one.  if that search comes up null, we are not over a data point.

you could still be over a line segment in this case, but we're only making the datapoints interactive, not the segments in between.  determining if you're on a line segment in between points will be a bit trickier.