I think I found a bug. I tried to make example as simple as possible (see attached project).
Exception (Object must be of type of the type of series) is thrown if I select the series line (1) and then clicking few times on the area of the graph (2). It seems to be more sensitive in the area “under” the graph.
It seems that it happens only if I use SeriesSelectionModifier.
FastMountainRenderableSeries seems to be more sensitive to this error than LineRenderableSeries.