如何在ControlTemplate中声明事件处理程序？

<ControlTemplate TargetType="Button">
    <Grid>
        <Border Background="{TemplateBinding Background}"
                BorderBrush="{TemplateBinding BorderBrush}"
                BorderThickness="{TemplateBinding BorderThickness}">
            <ContentPresenter HorizontalAlignment="Center"
                              VerticalAlignment="Center"/>
        </Border>
    </Grid>
    <ControlTemplate.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Background" Value="LightBlue"/>
        </Trigger>
    </ControlTemplate.Triggers>
    <EventSetter Event="Click" Handler="Button_Click"/>
</ControlTemplate>