Xaml Border issue - wpf

Question

I am using HeaderedContentControl for displaying my label & text box as below..
<Style x:Key="ContentBorderStyle" TargetType="Border">
<Setter Property="BorderBrush" Value="Blue"/>
</Style>
<Style TargetType="HeaderedContentControl" x:Key="BaseLabeledItemStyle">
<Style.Setters>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="HeaderedContentControl">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Border Grid.Column="0">
<ContentPresenter Name="header"
Content="{TemplateBinding Header}"/>
</Border>
<Border Grid.Column="1"
Style="{StaticResource ContentBorderStyle}">
<AdornerDecorator>
<ContentPresenter Name="content"
Content="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Content}"/>
</AdornerDecorator>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
<HeaderedContentControl
Style="{StaticResource ResourceKey=BaseLabeledItemStyle}"
Header="Emp Name">
<!--<ContentControl>-->
<TextBox x:Name="txtName"
Text="{Binding Path=EmpName, Mode=TwoWay, ValidatesOnDataErrors=True}"/>
</HeaderedContentControl>
As I am using Border brush as "Blue" for content control My content Control is always displaying with Blue border. When there is an validation error, my text box which I am using inside Headered content control's border is changing to red as I am using ValidationOnDataerror. now my requirement is to change even the content border too in Red Color when Validation occurs (i.e. when inner text box is in red color)...
I am attaching an Image how my control is populating.. in that (1) is border of my content control & (2) is my text box control.
How can I change the color of content control based on Text box color...
thanks in advance...

Answer 1

You could use a DataTrigger for additional highlighting
<Style x:Key="ContentBorderStyle" TargetType="Border">
<Setter Property="BorderBrush" Value="Blue"/>
<Style.Triggers>
<DataTrigger Binding="{Binding (Validation.HasError), ElementName=txtName}" Value="True">
<Setter Property="BorderBrush" Value="Red"/>
</DataTrigger>
</Style.Triggers>
</Style>
FYI:
If you want to show the Validation.ErrorTemplate on any other control than TextBox use Validation.ValidationAdornerSiteFor Attached Property. e.g.
<HeaderedContentControl Validation.ValidationAdornerSiteFor="{Binding ElementName=txtName}"
or
<Style x:Key="ContentBorderStyle" TargetType="Border">
<Setter Property="BorderBrush" Value="Blue"/>
<Setter Property="Validation.ValidationAdornerSiteFor" Value="{Binding ElementName=txtName}"/>
</Style>