XAML: Fade in and out animation

fadeinout.xaml

<!-- Invoke with ((Storyboard)FindResource("FadeInOut")).Begin(ControlName); -->
<ResourceDictionary>
    <Storyboard x:Key="FadeInOut">
        <!-- If the element has Visibility="Hidden". -->
        <ObjectAnimationUsingKeyFrames BeginTime="0:0:0" Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0">
                <DiscreteObjectKeyFrame.Value>
                    <Visibility>Visible</Visibility>
                </DiscreteObjectKeyFrame.Value>
            </DiscreteObjectKeyFrame>
        </ObjectAnimationUsingKeyFrames>
        <!-- Endif. -->
        <!-- If the element is hidden with Opacity="0.0". You need the following two lines in any case. -->
        <DoubleAnimation BeginTime="0:0:0.0" Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:0.5"/>
        <DoubleAnimation BeginTime="0:0:2.5" Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="0:0:0.5"/>
        <!-- If you want to re-set Visibility="Hidden". -->
        <ObjectAnimationUsingKeyFrames BeginTime="0:0:3.0" Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0">
                <DiscreteObjectKeyFrame.Value>
                    <Visibility>Hidden</Visibility>
                </DiscreteObjectKeyFrame.Value>
            </DiscreteObjectKeyFrame>
        </ObjectAnimationUsingKeyFrames>
        <!-- Endif. -->
    </Storyboard>
</ResourceDictionary>