Button PreviewMouseDown action and MouseDown action

  
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="AddHandler" Height="300" Width="300">
  <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
    <Button PreviewMouseDown="PreviewMouseDownButton" MouseDown="MouseDownButton">

      <Grid >
        <Grid.ColumnDefinitions>
          <ColumnDefinition />
          <ColumnDefinition />
        </Grid.ColumnDefinitions>

        <Canvas Width="20" Height="18" VerticalAlignment="Center">

          <Ellipse x:Name="myEllipse" Canvas.Left="1" Canvas.Top="1" Width="16" Height="16"
                   Fill="Yellow" Stroke="Black" />
        </Canvas>

      </Grid>
    </Button>
  </Grid>
</Window>
//File:Window.xaml.cs


using System;
using System.Windows;
using System.Diagnostics;
using System.Windows.Shapes;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : System.Windows.Window
    {
        public Window1()
        {
            InitializeComponent();

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


    }
}

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Button PreviewMouseDown action and MouseDown action : Button « Windows Presentation Foundation « C# / C Sharp

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