Code pulled from a baked png

gistfile1.xml

<Validation.ErrorTemplate>
    <ControlTemplate>
        <DockPanel x:Name="root" Opacity="0">
            <Grid x:Name="errorMessage" DockPanel.Dock="Bottom" Opacity="0" RenderTransformOrigin="0, 0">
                <Grid.RenderTransform>
                    <TranslateTransform x:Name="xform" X="0" />
                </Grid.RenderTransform>
                <Border Background="Red" CornerRadius="0" HorizontalAlignment="Stretch" />
                <Border CornerRadius="0">
                    <TextBlock Foreground="{DynamicResource WhiteColorBrush}" Margin="8, 4, 8, 4" TextWrapping="Wrap" Text="{Binding ErrorContent}" UseLayoutRounding="False" />
                </Border>
            </Grid>
        </DockPanel>
        <ControlTemplate.Triggers>
            <EventTrigger RoutedEvent="Loaded">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="root">
                            <SplineDoubleKeyFrame KeyTime="0:0:0.2" Value="1" />
                        </DoubleAnimationUsingKeyFrames>
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>
            <DataTrigger Binding="{Binding AdornedElement.IsFocused, ElementName=adnornedLayer}" Value="True">
                <DataTrigger.EnterActions>
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="X" Storyboard.TargetName="xform">
                                <SplineDoubleKeyFrame KeyTime="0:0:0.0" Value="25.0" />
                                <SplineDoubleKeyFrame KeyTime="0:0:0.1" Value="0" />
                            </DoubleAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="errorMessage">
                                <SplineDoubleKeyFrame KeyTime="0:0:0.2" Value="1" />
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </DataTrigger.EnterActions>
                <DataTrigger.ExitActions>
                    <BeginStoryboard>
                        <Storyboard>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="X" Storyboard.TargetName="xform">
                                <SplineDoubleKeyFrame KeyTime="0:0:0.0" Value="0" />
                                <SplineDoubleKeyFrame KeyTime="0:0:0.1" Value="25" />
                            </DoubleAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="errorMessage">
                                <SplineDoubleKeyFrame KeyTime="0:0:0.2" Value="0" />
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </DataTrigger.ExitActions>
            </DataTrigger>
        </ControlTemplate.Triggers>
    </ControlTemplate>
</Validation.ErrorTemplate>