Hello Valentin,
I would like to inform you that the Plotelements do not receive mouse events when chart panel is placed over them.
However, try setting the 'IsHitTestVisible’ property of the ChartPanel object to 'False’ :
<c1:ChartPanel IsHitTestVisible="False" Background="{StaticResource transparentGreenBrush}"> </c1:ChartPanel>
Hope it helps.
Regards,
Reema