WPF TextBox border on Windows7 - wpf

Question

In Windows7 (maybe vista too), TextBoxes now get a blue emphasis rect when they receive input focus or get the MouseOver.
In my WPF app, that blue focus rect really sticks out like a sore thumb - it does NOT match the visual style of the rest of the app.
How do I disable it - or better yet, customise it?
(Setting FocusVisualStyle to {x:Null} in the xaml does nothing.)

Answer 1

This is because of the default style applied for the TextBox. To modify this behavior you have to create a custom style/template. just have a look at this sample
<Style x:Key="TextBoxStyle1" BasedOn="{x:Null}" TargetType="{x:Type TextBox}">
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Padding" Value="1"/>
<Setter Property="AllowDrop" Value="true"/>
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Border x:Name="border" Background="#FF8F8F8F" BorderBrush="#FF585858" CornerRadius="3" BorderThickness="2">
<ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsFocused" Value="True">
<Setter Property="BorderBrush" TargetName="border" Value="Silver"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Opacity" TargetName="border" Value="0.15"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" TargetName="border" Value="Silver"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>