wpf RenderTransfor в стиле

[D][mon]

<Setter Property="RenderTransform">
                <Setter.Value>
                        <RotateTransform/>
                </Setter.Value>

Почему value нельзя назначить TransformGroup
в этом случае вся группка как будто игнорируется
вот весь стиль:

        <Style TargetType="{x:Type Image}">
            <Setter Property="FlowDirection" Value="LeftToRight"/>
            <Setter Property="RenderTransform">
                <Setter.Value>
                    <TransformGroup>
                        <ScaleTransform/>
                        <SkewTransform/>
                        <RotateTransform/>
                        <TranslateTransform/>
                    </TransformGroup>
                </Setter.Value>
            </Setter>
            <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
            <Style.Triggers>
                <EventTrigger RoutedEvent="Image.MouseEnter">
                    <BeginStoryboard>
                        <Storyboard AutoReverse="False" RepeatBehavior="3x">
			<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="RenderTransform.Angle">
				<EasingDoubleKeyFrame KeyTime="0" Value="0"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="-15"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="15"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.8" Value="0"/>
			</DoubleAnimationUsingKeyFrames>
			<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="RenderTransform.ScaleY">
				<EasingDoubleKeyFrame KeyTime="0" Value="1"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="1.1"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="0.9"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.8" Value="1"/>
			</DoubleAnimationUsingKeyFrames>
			<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="RenderTransform.ScaleX">
				<EasingDoubleKeyFrame KeyTime="0" Value="1"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="1.1"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="0.9"/>
				<EasingDoubleKeyFrame KeyTime="0:0:0.8" Value="1"/>
			</DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Style.Triggers>
        </Style>