private void FakePassword_GetFocus(object sender, EventArgs e)
 {
     if (isPasswordPlaceholder)
     {
         (sender as TextBox).Visibility = System.Windows.Visibility.Collapsed;
         RealPassword.Visibility        = System.Windows.Visibility.Visible;
         RealPassword.Background        = new SolidColorBrush(Color.FromRgb(255, 255, 255));
         RealPassword.Focus();
         isPasswordPlaceholder = false;
     }
 }
        // Кнопка Enter, перевірка внесених даних
        private void buttonEnter_Click(object sender, EventArgs e)
        {
            string nickname = RealName.Text;
            string password = RealPassword.Text;

            if (password == RealtPassword || nickname == RealtName)
            {
                this.Close();
                Realtor user = new Realtor(nickname, password);
                UserChanged.Invoke(this, EventArgs.Empty);
            }
            else
            {
                MessageBox.Show(" Please, check your name and  pass");
                RealName.Clear();
                RealPassword.Clear();
            }
        }