<Grid

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="clr-namespace:Testing">

<Grid.Resources>

<local:PassConverter x:Key="conv"/>

<ControlTemplate x:Key="ct" TargetType="Control">

<ControlTemplate.Resources>

<Storyboard x:Key="anim">

<DoubleAnimationUsingKeyFrames Storyboard.TargetName="scalingGrid" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(ScaleTransform.ScaleX)">

<EasingDoubleKeyFrame KeyTime="0" Value="1"/>

<EasingDoubleKeyFrame KeyTime="0:0:1" Value="3"/>

<EasingDoubleKeyFrame KeyTime="0:0:2" Value="1"/>

</DoubleAnimationUsingKeyFrames>

</Storyboard>

</ControlTemplate.Resources>

<Grid x:Name="scalingGrid" Background="Red" RenderTransformOrigin="0.5,0.5">

<Grid.RenderTransform>

<TransformGroup>

<ScaleTransform/>

<SkewTransform/>

<RotateTransform/>

<TranslateTransform/>

</TransformGroup>

</Grid.RenderTransform>

<Grid RenderTransformOrigin="0.5,0.5" Margin="20" Background="#8000FF00" RenderTransform="{Binding RenderTransform, ElementName=scalingGrid, Converter={StaticResource conv}}"/>

</Grid>

<ControlTemplate.Triggers>

<EventTrigger RoutedEvent="MouseEnter">

<BeginStoryboard Storyboard="{StaticResource anim}"/>

</EventTrigger>

</ControlTemplate.Triggers>

</ControlTemplate>

</Grid.Resources>

<Control Width="100" Height="100" Template="{StaticResource ct}"/>

</Grid>