MahApps.Metro.Controls.Dialogs.ProgressDialogController.SetTitle C# (CSharp) Method

        public void SetTitle(string title)
        {
            this.WrappedDialog.Invoke(() => this.WrappedDialog.Title = title);
        }

		private async void BtnRegister_Click(object sender, RoutedEventArgs e)
		{
			if(!CheckBoxPrivacyPolicy.IsChecked == true)
				return;

			var email = TextBoxRegisterEmail.Text;
			if(string.IsNullOrEmpty(email) || !Regex.IsMatch(email, @".*@.*\..*"))
			{
				DisplayLoginError("Please enter an valid email address");
				return;
			}
			if(string.IsNullOrEmpty(TextBoxRegisterPassword.Password))
			{
				DisplayLoginError("Please enter a password");
				return;
			}
			if(TextBoxRegisterPassword.Password.Length < 6)
			{
				DisplayLoginError("Your password needs to be at least 6 characters");
				return;
			}
			if(string.IsNullOrEmpty(TextBoxRegisterPasswordConfirm.Password))
			{
				DisplayLoginError("Please confirm your password");
				return;
			}
			if(!TextBoxRegisterPassword.Password.Equals(TextBoxRegisterPasswordConfirm.Password))
			{
				DisplayLoginError("Entered passwords do not match");
				return;
			}
			IsEnabled = false;
			_controller = await this.ShowProgressAsync("Registering account...", "");
			var result = await HearthStatsAPI.RegisterAsync(email, TextBoxRegisterPassword.Password);
			if(result.Success)
			{
				_controller.SetTitle("Logging in...");
				result = await HearthStatsAPI.LoginAsync(email, TextBoxRegisterPassword.Password);
			}
			else if(result.Message.Contains("422"))
				DisplayLoginError("Email already registered");
			else
				DisplayLoginError(result.Message);
			TextBoxRegisterPassword.Clear();
			TextBoxRegisterPasswordConfirm.Clear();
			if(result.Success)
			{
				var mw = new MainWindow();
				mw.Show();
				Close();
			}
		}