<Window
    x:Class="TimeCountDown.Blink"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:TimeCountDown"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="Blink"
    Width="800"
    Height="450"
    mc:Ignorable="d">
    <Window.Resources>
        <Style TargetType="Label">
            <Style.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Tag}" Value="0">
                    <Setter Property="Background" Value="Green">
                    </Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Tag}" Value="1">
                    <Setter Property="Background" Value="Red">
                    </Setter>
                </DataTrigger>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Tag}" Value="2">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard Name="Shine">
                            <Storyboard RepeatBehavior="Forever">
                                <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="Background.Color">
                                    <EasingColorKeyFrame KeyTime="0" Value="Red">
                                    </EasingColorKeyFrame>
                                    <EasingColorKeyFrame KeyTime="0:0:0.5" Value="Green">
                                    </EasingColorKeyFrame>
                                </ColorAnimationUsingKeyFrames>
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                    <DataTrigger.ExitActions>
                        <StopStoryboard BeginStoryboardName="Shine" />
                    </DataTrigger.ExitActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <StackPanel HorizontalAlignment="Center">
            <Label
                Width="81"
                Height="45"
                Margin="5"
                Foreground="White"
                Tag="0" />
            <Label
                Width="81"
                Height="45"
                Margin="5"
                Foreground="White"
                Tag="1" />
            <Label
                Width="81"
                Height="45"
                Margin="5"
                Background="Green"
                Foreground="White"
                Tag="2" />
        </StackPanel>
    </Grid>
</Window>