How to subscribe legend's click event?

[bbiii]

sorry i cant find click or point event in CustomLegend/SKDefaultLegend .
i thought maybe can add Button or WPF StackPanel to my custom legend , but only can add a few attributes or specific layout in your GetLayout() method.
can you tell me how to fix my problem ? thanks , i just wanna hide/show line by click legend , every sample on net were old version LiveCharts ..

[Evan260]

Untitled.video.mp4

Something like this would be cool