message: Validation error template - shadow effect (win)
diff: DataContext="{Binding ElementName=placeholder}"
  StrokeThickness="0" />
  <Border x:Name="ValidationErrorElement"
  - BorderBrush="{DynamicResource ControlsValidationBrush}"
  + BorderBrush="{DynamicResource Toggl.ValidationErrorBackground}"
  BorderThickness="1"
  DataContext="{Binding ElementName=placeholder}">
  </Border>
  AllowsTransparency="True"
  IsOpen="False"
  PlacementTarget="{Binding ElementName=PopupTargetElement, Mode=OneWay}">
  - <Grid x:Name="Root" Margin="2">
  + <Grid x:Name="Root" Margin="5">
  <Grid.Resources>
  <Style TargetType="Border">
  <Style.Triggers>
  </Style.Triggers>
  </Style>
  </Grid.Resources>
  - <Border Background="{DynamicResource Toggl.ValidationErrorBackground}">
  + <Border Background="{DynamicResource Toggl.ValidationErrorBackground}"
  + Margin="0 0 0 -1"
  + Width="{Binding ElementName=ValidationErrorElement, Path=ActualWidth, Mode=OneWay}">
  + <Border.Effect>
  + <DropShadowEffect ShadowDepth="2"
  + BlurRadius="3"
  + Direction="270"
  + Color="Black"
  + Opacity="0.2"/>
  + </Border.Effect>
  <!--
  from Josh Smith
  