wpf rotatetransform＆mdash;如何让我的控制位置恢复正常？

<Button Content="HelloWorld">
    <Button.RenderTransform>
        <RotateTransform Angle="270" />
    </Button.RenderTransform>
</Button>

<Button x:Name="MyButton" Content="HelloWorld">
    <Button.RenderTransform>
        <TransformGroup>
            <RotateTransform Angle="270" />
            <TranslateTransform Y="{Binding ActualWidth, ElementName=MyButton}" />
        </TransformGroup>
    </Button.RenderTransform>
</Button>