public override void OpenContextMenu(int groupIndex)
{
GenericMenu menu = new GenericMenu();
int index = groupIndex;
menu.AddToggableItem("Set as default", false, () => SetAsDefault(index), Map.defaultGroup != index);
menu.AddItem("Add", false, () => Add(index));
menu.AddItem("Delete", false, () => DeleteGroup(index));
menu.ShowAsContext();
}