private void btnAdd_Click(object sender, RoutedEventArgs e)
{
AddPerson add = new AddPerson();
add.people = people;
add.ShowDialog();
}
private void MenuItem_Click_1(object sender, RoutedEventArgs e)
{
AddPerson dialog = new AddPerson();
if (dialog.ShowDialog() == true)
{
people.Add(dialog.person);
}
}