WPF auto fading error message

Here is a small control template to display an error message. The message will fade away after a couple of seconds. You set the message like this:-

Label1.Content = DateTime.Now.ToString();

Here is the xaml:-

<Window x:Class="TRM_Uploader.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window2" Height="300" Width="300">
    <Window.Resources>
        <ControlTemplate x:Key="MyErrorMessage"
                         TargetType="{x:Type Label}">
            <StackPanel Orientation="Horizontal"
                        Name="ErrorMessage">
                <Border CornerRadius="4"
                        BorderThickness="0"
                        Background="Red"
                        VerticalAlignment="Center"
                        Margin="4,0"
                        BorderBrush="Transparent">
                    <Label Foreground="White"
                           VerticalAlignment="Center"
                           Padding="4,2"
                           FontWeight="Bold"
                           Name="Part1"
                           Visibility="Visible">Error</Label>
                </Border>
                <!-- This TextBlock accepts the content from the parent 'label'. It is not actually displayed, just used to bind data-->
                <TextBlock Name="Part3"
                           Text="{TemplateBinding Content}"
                           Visibility="Collapsed"></TextBlock>
                <!-- This TextBlock binds to the one above and triggers an animation when it gets updated. -->
                <!-- Its required because TemplateBinding does not allow NotifyOnTargetUpdate -->
                <TextBlock Margin="2"
                           Name="Part2"
                           Foreground="Red"
                           Padding="3"
                           Text="{Binding ElementName=Part3, Path=Text,NotifyOnTargetUpdated=True}"
                           VerticalAlignment="Center"></TextBlock>
            </StackPanel>
            <ControlTemplate.Triggers>
                <!-- When Text property of Part2 is blank hide entire control-->
                <Trigger SourceName="Part3"
                         Property="Text"
                         Value="">
                    <Setter TargetName="ErrorMessage"
                            Property="Visibility"
                            Value="Hidden"></Setter>
                </Trigger>
                <!-- This trigger is called when Part2 updates which in turn is updated by Part3's databind.
                     It uses animation to make the label fade away after a few seconds.                        -->
                <EventTrigger SourceName="Part2"
                              RoutedEvent="Binding.TargetUpdated">
                    <BeginStoryboard>
                        <Storyboard TargetName="ErrorMessage">
                            <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                             Duration="0:0:0"
                                             To="1.0" />
                            <DoubleAnimation Storyboard.TargetProperty="Opacity"
                                             Duration="0:0:2"
                                             From="1.0"
                                             To="0.0"
                                             BeginTime="0:0:1" />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </Window.Resources>
    <StackPanel Orientation="Vertical">
        <Label Template="{StaticResource MyErrorMessage}"
               Name="Label1"></Label>
        <Button Click="button1_Click">click to test</Button>
    </StackPanel>
</Window>

And the c#

 

public partial class Window2 : Window
    {
    public Window2 ()
        {
        InitializeComponent();
        }

private void button1_Click (object sender, RoutedEventArgs e)
        {
        Label1.Content = DateTime.Now.ToString();
        }
    }