<Window x:Class="Main"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="" Height="300" Width="300">
<Grid>
<Rectangle Height="100" Width="100" Fill="Firebrick" Stroke="Black" StrokeThickness="1">
<Rectangle.Style>
<Style TargetType="Rectangle">
<Style.Triggers>
<EventTrigger RoutedEvent="Rectangle.MouseEnter">
<BeginStoryboard>
<Storyboard>
<ParallelTimeline RepeatBehavior="Forever" AutoReverse="True">
<DoubleAnimation Storyboard.TargetProperty="Width" To="150" />
<DoubleAnimation Storyboard.TargetProperty="Height" To="150" />
<ColorAnimation Storyboard.TargetProperty="Fill.Color" To="Orange" />
</ParallelTimeline>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</Rectangle.Style>
</Rectangle>
</Grid>
</Window>
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