how to get listview subitems in wpf

hi,

    I have a problem in get listview subitem values in wpf..i m using following coding but i got an error please help....

private void lvUsers_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            cmpy.companypro = lvUsers.SelectedItems[0].SubItems[1].Text;

       }

error in subitems..but it works in winforms.