TextBlock Opacity Animation
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <TextBlock x:Name="txtblk" Text="XAML" FontSize="144pt" FontFamily="Arial Black" HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBlock.Triggers> <EventTrigger RoutedEvent="TextBlock.Loaded"> <BeginStoryboard> <Storyboard TargetName="txtblk" TargetProperty="Opacity" RepeatBehavior="Forever"> <DoubleAnimationUsingPath Duration="0:0:4" Source="Y"> <DoubleAnimationUsingPath.PathGeometry> <PathGeometry> <PathGeometry.Figures> <PathFigure StartPoint="0 0"> <LineSegment Point="0 1" /> <LineSegment Point="2 1" /> <LineSegment Point="2 0" /> </PathFigure> </PathGeometry.Figures> </PathGeometry> </DoubleAnimationUsingPath.PathGeometry> </DoubleAnimationUsingPath> </Storyboard> </BeginStoryboard> </EventTrigger> </TextBlock.Triggers> </TextBlock> </Page>