Validation Error Templates For UserControl - wpf

Question

I have built an UserControl. I don't like the red border showing around it when validation errors occur. I have a textbox inside my control.
How can I override the validation error style to get rid of the red border in the whole control and just show a red background in the textbox inside my usercontrol?
Thanks!

Answer 1

I am using this template that will color the background of the textbox instead of showing just the border.
<UserControl.Resources>
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true" >
<Setter Property="Foreground" Value="Red"/>
<Setter Property="Background" Value="MistyRose"/>
<Setter Property="BorderBrush" Value="Red"/>
<Setter Property="BorderThickness" Value="1.0"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource
Self},Path=(Validation.Errors)[0].ErrorContent}"/>
</Trigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
And all I have to do to your DocPannel Where the controls are located for example for me inside a DockPanel then i have to set its Validation.Error template to nothing this will remove the border.
For Ex:
<TextBox >
<Validation.ErrorTemplate>
<ControlTemplate>
</ControlTemplate>
</Validation.ErrorTemplate>
</TextBox>

Answer 2

On the style for your user control:
<Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
On the style for your textbox:
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBoxBase}">
<Border
Name="Border"
CornerRadius="5"
Padding="2"
BorderBrush="{TemplateBinding BorderBrush}"
Background="{TemplateBinding Background}"
BorderThickness="{TemplateBinding BorderThickness}" >
<ScrollViewer Margin="0" x:Name="PART_ContentHost"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Border" Property="Background" Value="LightGray"/>
<Setter TargetName="Border" Property="BorderBrush" Value="Black"/>
<Setter Property="Foreground" Value="Gray"/>
</Trigger>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="BorderBrush" TargetName="Border" Value="{DynamicResource ErrorBorderColor}"/>
<Setter Property="Background" TargetName="Border" Value="{DynamicResource ErrorBackgroundColor}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>