WPF DataGrid GroupStyle

Question

I have the following DataGrid in WPF with two groups.
First group is a bool flag which represents if a person is active/inactive.
The second group (or sub-g

Answer 1

I would highly recommend changing the data structure to:

public class Person {
    public bool Active { get; set; }
    public int ID { get; set; }
    public string Name { get; set; }

    public Collection Cities { get; set; }
}

Otherwise you can change this GroupStyle

To

Change the template to suit your needs