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Making the Validation Error on TextBox thicker

Posted By:      Posted Date: October 18, 2010    Points: 0   Category :WPF

A few of my users would like the validation error on the textbox to be more prominent. 

I have added this to my ResourceDictionary...

<Style TargetType="{x:Type TextBox}">
  <Trigger Property="Validation.HasError" Value="true">
   <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}"/>
   <Setter Property="BorderThickness" Value="3" />
   <Setter Property="FontWeight" Value="Heavy" />

The text does indeed go heavy on validation, but the red outline stays the same.  I am guessing BorderThickness is not the correct property to set.

  1. What is the appropriate property to set?
  2. Is there a place to look at what the WPF default is for TextBox Validation.HasError?

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