鼠标按下事件未触发（冒泡事件）

Question

I am a novice to WPF. I started learning about RoutedEvents in WPF. I tried a sample and i met up with a problem

    <Grid Margin="5" Name="Grid" MouseDown="Window_MouseUp">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
        <RowDefinition Height="Auto"></RowDefinition>
    </Grid.RowDefinitions>
    <Label BorderBrush="Black" BorderThickness="1" Grid.Row="0" Margin="5"        Name="FancyLabel" MouseDown="Window_MouseUp" >
        <StackPanel Name="Stack" MouseDown="Window_MouseUp"> 
            <TextBlock Margin="3" Name="txtBlock1">
                Click Any Where
            </TextBlock>
            <TextBlock Margin="50" Name="txtBlock2" >
                Click me also
            </TextBlock>
        </StackPanel>
    </Label>
    <ListBox Grid.Row="1" Margin="5" Name="ListMessages"/>
    <Button Grid.Row="3" Margin="5" Name="cmd_Clear" MouseDown="Cmd_Clear_MouseDown"  >Clear</Button>
</Grid>

The handler for the mouseDown event of the button is different from others int the tree hierarchy. The event is not firing..

But if i add in the .cs file the following code

 Grid.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Window_MouseUp),true);
 Stack.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Window_MouseUp), true);
 FancyLabel.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Window_MouseUp), true);
 txtBlock1.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Window_MouseUp), true);
 txtBlock2.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Window_MouseUp), true);
 Img1.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Window_MouseUp), true);
 cmd_Clear.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Cmd_Clear_MouseDown), true);

the Cmd_Clear_MouseDown event is fired and the event is bubbled up to the grid and the grid fires Window_MouseUp.

Answer 1

Two points:

1) Is MouseDown="Window_MouseUp" everywhere intended?

2) Why not register to Click event with ClickMode="Press" instead of MouseDown . I don't think Button provides/raises MouseDown unless may be with a custom template.

Example:

<Button Grid.Row="3"
        Margin="5"
        Name="cmd_Clear"
        ClickMode="Press"
        Click="Cmd_Clear_MouseDown">Clear</Button>