wpf 如何让控件左右移动

<Canvas x:Name="canvas_Shape" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="720" Margin="12,0" Grid.Column="1" Grid.RowSpan="7" >
            <Canvas.Triggers>
                <EventTrigger RoutedEvent="FrameworkElement.Loaded">
                    <BeginStoryboard >
                        <Storyboard Storyboard.TargetName="bendediction" Storyboard.TargetProperty="(Canvas.Left)">
                            <DoubleAnimation From="0" To="400" Duration="0:0:10" RepeatBehavior="23:59:59" AutoReverse="True"/>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Canvas.Triggers>
            <Button x:Name="bendediction" Style="{DynamicResource ButtonStyle}"  Canvas.Top="200"/>
        </Canvas>