How Programmatically tap the Wp8 screen

Question

In my app i am working with tap events, by taping on my WP screen im displaying the X,Y Coordinates in Text-block. now trying to tap Programmatically on Screen with passing X,Y Coordinates. How can i do that .

Hear is my code to get X,Y Values

 private void GestureListener_Tap(object sender, 
        Microsoft.Phone.Controls.GestureEventArgs e)
        {
        try
        {
          Point tapLocation = e.GetPosition(viewfinderCanvas);
        if (tapLocation != null)
        {
          focusBracket.SetValue(Canvas.LeftProperty,
        tapLocation.X);
          focusBracket.SetValue(Canvas.TopProperty, 
        tapLocation.Y);
          double tapX = tapLocation.X;
          double tapY = tapLocation.Y;
          focusBracket.Visibility = Visibility.Visible;
        this.Dispatcher.BeginInvoke(delegate()
        {
          this.txtDebug.Text = string.Format("Tapping Coordinates are X={0:N2}, Y={1:N2}", tapX, tapY);
        });
        }
        }
        catch (Exception error){
        this.Dispatcher.BeginInvoke(delegate()
        {
          txtDebug.Text = error.Message;

        }); }}

Thanks in Advance