Legend with groups of series - possibility to enable/disable all series from the group?

[abrasat]

Feature description

Is it possible to add a feature to a legend containing groups of series, to enable/disable all series from the group, when clicking on the group name?
It would be a similar feature to enabling/disabling single series, by clicking on their name in the legend.
Or is at least possible to catch the click event on the group name?

[abrasat]

I think that the Legend.Rendering.cs could be extended with something like a SeriesGroupPosMap, similar to the SeriesPosMap. This would allow in the LegendHitTest method the identification the group name that was clicked. Additionally, a custom callback could be supported in the LegendHitTest, to allow the application to add its own logic for handling the click event on a series or group from the legend box.

[VisualMelon]

The legend hit-testing will probably need re-designing at some point (it isn't very extensible at the moment, as you say), but your proposal of a SeriesGroupPosMap (maybe SeriesGroupTitlePosMap) could be done very simply for the moment.