private void Button_Click(object sender, RoutedEventArgs e)
    {
        AntlrInputStream input = new AntlrInputStream(this.ViewModel.stText);
        STLexer lexer = new STLexer(input);
        lexer.RemoveErrorListeners();
        lexer.AddErrorListener(new ThrowExceptionErrorListener());
        CommonTokenStream tokens = new CommonTokenStream(lexer);
        STParser parser = new STParser(tokens);
        IParseTree tree = parser.program();

        if (parser.NumberOfSyntaxErrors > 0)
        {
            Build.Text = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:sszzz") + "r" + parser.NumberOfSyntaxErrors.ToString() + " Build Error";
            CEditor.Text = "";
        }
        else
        {
            var listener = new ExtractInterfaceListener(parser);
            ParseTreeWalker walker = new ParseTreeWalker();
            walker.Walk(listener, tree);
            CEditor.Text = listener.code;
            Build.Text = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:sszzz") + "r" + "No Errors";
        }
    }