如何在事件加载时通过EventTrigger使ScaleTransform (渲染变换)的XAML-only动画工作？

<Button Content="Click Me">
    <Button.RenderTransform>
        <ScaleTransform x:Name="scaleTransform" ScaleX="1" ScaleY="1" />
    </Button.RenderTransform>
</Button>

<VisualStateManager.VisualStateGroups>
    <VisualStateGroup>
        <VisualState x:Name="Animate">
            <Storyboard>
                <DoubleAnimation Storyboard.TargetName="scaleTransform" Storyboard.TargetProperty="ScaleX" To="2" Duration="0:0:1" />
                <DoubleAnimation Storyboard.TargetName="scaleTransform" Storyboard.TargetProperty="ScaleY" To="2" Duration="0:0:1" />
            </Storyboard>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>

<Button Content="Click Me">
    <Button.RenderTransform>
        <ScaleTransform x:Name="scaleTransform" ScaleX="1" ScaleY="1" />
    </Button.RenderTransform>
    <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
            <BeginStoryboard>
                <Storyboard>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="scaleTransform" Storyboard.TargetProperty="RenderTransform">
                        <DiscreteObjectKeyFrame KeyTime="0" Value="{x:Null}" />
                    </ObjectAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Button.Triggers>
</Button>