Button PreviewMouseLeftButtonDown action and MouseLeftButtonDown action

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<Window x:Class="TunnelingBubbling.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TunnelingBubbling">
  
    <Grid MouseLeftButtonDown="MouseDownGrid"
          PreviewMouseLeftButtonDown="PreviewMouseDownGrid"
      Width="300" Height="300">

    <Button PreviewMouseLeftButtonDown="PreviewMouseDownButton"
      MouseLeftButtonDown="MouseDownButton"
      Click="MyClickEvent"
      Name="btnGo">

      <TextBox MouseLeftButtonDown="MouseLeftButtonDown"
        PreviewMouseLeftButtonDown="PreviewMouseLeftButtonDown"
        Width="200" Height="30" Name="textBox1">
      </TextBox>
    </Button>
  </Grid>  
</Window>
//File:Window.xaml.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Diagnostics;

namespace TunnelingBubbling
{
    public partial class Window1 : System.Windows.Window
    {

        public Window1()
        {
            InitializeComponent();
        }

        private void PreviewMouseDownGrid(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("PreviewMouseDownGrid");
        }

        private void PreviewMouseDownButton(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("PreviewMouseDownButton");
        }

        private void PreviewMouseLeftButtonDown(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("PreviewMouseLeftButtonDown");
        }

        private void MyClickEvent(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MyClickEvent");
        }

        private void MouseLeftButtonDown(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MouseLeftButtonDown");
        }

        private void MouseDownButton(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MouseDownButton");
        }

        private void MouseDownGrid(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine("MouseDownGrid");
        }

    }
}