Easing double animation

    <DoubleAnimation Storyboard.TargetProperty="(UserControl.Opacity)"
                     To="1"
                     Duration="0:0:1">
        <DoubleAnimation.EasingFunction>
            <QuadraticEase EasingMode="EaseIn" />
        </DoubleAnimation.EasingFunction>
    </DoubleAnimation>