Как добавить анимацию к элементам в XAML?

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<Grid>
    <Grid.Resources>
        <Storyboard x:Key="FadeIn">
            <DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:1"/>
        </Storyboard>
    </Grid.Resources>
    
    <Rectangle Name="myRectangle" Width="50" Height="50" Fill="Red" Opacity="0">
        <Rectangle.Triggers>
            <EventTrigger RoutedEvent="Loaded">
                <BeginStoryboard Storyboard="{StaticResource FadeIn}"/>
            </EventTrigger>
        </Rectangle.Triggers>
    </Rectangle>
</Grid>