private void addChildItem(IReadOnlyList <Person> childs, PersonItem parent = null)
{
foreach (var child in childs)
{
var citem = new PersonItem(child, parent);
parent?.AddChild(citem);
PeopleItems.Add(citem);
addChildItem(child.Childs, citem);
}
}
public void AddChild(PersonItem child)
{
childs.Add(child);
}