void xaphuongclick(object sender, RoutedEventArgs e)
{
frmxaphuong frmxaphuong = new frmxaphuong();
frmxaphuong.Show();
}
private void ChildWindow_Closed(object sender, EventArgs e)
{
frmxaphuong frm = new frmxaphuong();
frm.Show();
}
