<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">
<Window.Resources>
<Storyboard x:Key="rect1Storyboard" Storyboard.TargetName="rect1">
<ParallelTimeline>
<DoubleAnimation To="50" Duration="0:0:10" FillBehavior="Stop" Storyboard.TargetProperty="Width" />
<DoubleAnimation To="50" Duration="0:0:5" FillBehavior="HoldEnd" AccelerationRatio="0.5" DecelerationRatio="0.25" Storyboard.TargetProperty="Height" />
</ParallelTimeline>
</Storyboard>
</Window.Resources>
<Window.Triggers>
<EventTrigger RoutedEvent="Rectangle.Loaded" SourceName="rect1">
<BeginStoryboard Storyboard="{StaticResource rect1Storyboard}" />
</EventTrigger>
</Window.Triggers>
<Grid>
<Rectangle x:Name="rect1" Margin="10" Width="100" Height="100" Fill="Firebrick" Grid.Column="1" />
</Grid>
</Window>
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