private void button1_Copy_Click(object sender, RoutedEventArgs e)
        {
            if (children_listView.SelectedIndex == -1)
            {
                return;
            }

            _Children.AddNewChild newChildForm = new _Children.AddNewChild();
            newChildForm.EditedChild = (Child)children_listView.SelectedItem;
            newChildForm.ShowDialog();
        }
 private void button1_Click(object sender, RoutedEventArgs e)
 {
     _Children.AddNewChild newChildForm = new _Children.AddNewChild();
     newChildForm.ShowDialog();
 }