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Canvas 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>       <Grid>         <Grid.ColumnDefinitions>           <ColumnDefinition />           <ColumnDefinition />         </Grid.ColumnDefinitions>         <Canvas PreviewMouseDown="PreviewMouseDownCanvas" MouseDown="MouseDownCanvas"                 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 PreviewMouseDownCanvas(object sender, RoutedEventArgs e){              Debug.WriteLine("PreviewMouseDownCanvas");          }         void MouseDownCanvas(object sender, RoutedEventArgs e){              Debug.WriteLine("MouseDownCanvas");          }     } }