What is the trick to change the background on the group headers?
I've tried the following with out luck (using latest version of the NuGet):
public void OnGroupRowRender(GroupRowRenderEventArgs args) => args.Attributes.Add("style", $"background-color: var(--rz-success-lighter);");
In addition the background color comes from the td element and the style you set is applied to its parent tr element. Another possible solution is to add this CSS rule