Pseudo code to reproduce the problem.
1.
void
OnFirstButtonClick(){
Chart.Series.Clear();
var series =
new
LineSeries() {RenderMode = SeriesRenderMode.Light};
Chart.Series.Add(series);
}
// I can see added series, it's OK
2.
void
OnSecondButtonClick(){
Chart.Series.Clear();
var series =
new
LineSeries();
Chart.Series.Add(series);
}
// I see new series and series from the first step. Why?
// If the first series are rendered with Full RenderMode, I see only the second.