private void messeges_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
Messege m = new Messege(iduser, group);
m.Show();
this.Close();
}
private void Messege_Click(object sender, RoutedEventArgs e)
{
Messege m = new Messege(idteacher, groupteacher);
m.Show();
this.Close();
}