Problem with PromptBuilder

I have created this code in order to be able to copy everything that speaks in a text box, but I want it to be able to be done outside the text box.

Here is the code that implements Code:

using System.Windows;
using System.Speech.Synthesis;
using System.Speech.Recognition;

namespace Test
{
public partial class MainWindow : Window
{        
    PromptBuilder dictado = new PromptBuilder();
    SpeechSynthesizer habla = new SpeechSynthesizer();
    SpeechRecognitionEngine escucha = new SpeechRecognitionEngine();
    string speech;
    public MainWindow()
    {
        InitializeComponent();
        ActivarEscucha();
    }


    private void ActivarEscucha()
    {
        escucha.SetInputToDefaultAudioDevice();
        escucha.LoadGrammar(new DictationGrammar());
        escucha.RecognizeAsync(RecognizeMode.Multiple);
        escucha.SpeechRecognized += Escucha_SpeechRecognized;
        habla.SpeakAsync("Esperando Dictado");
    }

    private void Escucha_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
    {
        speech = e.Result.Text;
// dictado.AppendText(speech);        
    textbox.AppendText(speech); <-- si yo coloco esta linea, me escribe lo que hable en el textbox, yo necesito es que lo escriba fuera del textbox

    }
}

}

I hope you can help me solve this problem, thank you.