private void BAdd_Click(object sender, RoutedEventArgs e)
        {
            if (!UsersServices.ExistLogin(TBlogin.Text))
            {
                if (TBPaterno.Text != "" &&
                    TBMaterno.Text != "" &&
                    TBlogin.Text != "" &&
                    TBPassword.Text != "")
                {
                    UsersServices.AddThisUser(TBName.Text,
                                              TBPaterno.Text,
                                              TBMaterno.Text,
                                              TBlogin.Text,
                                              TBPassword.Text);
                }
                else
                {
                    ShowMessage("Error", "No se puedo Agregar al Usuario");
                }

                showAllUser();
                cleanFields();
            }
            else
            {
                ShowMessage("Error", "El usuario ya existe, use otro login");
            }
        }