Can you use a Binding ValidationRule within 1 line in xaml?

I don't know the correct wording to describe what I'm trying to do here... so I'll just show it.

This xaml I know works:

<TextBox>
  <TextBox.Text>
    <Binding Path="Location" UpdateSourceTrigger="PropertyChanged">
      <Binding.ValidationRules>
        <domain:NotEmptyValidationRule ValidatesOnTargetUpdated="True"/>
      </Binding.ValidationRules>
    </Binding>
  </TextBox.Text>
</TextBox>

But this is pretty verbose. I would like to do it in a way similar to this...

<TextBox Text={Binding Path=Location, UpdateSourceTrigger=PropertyChanged,
                       ValidationRules={domain:NotEmptyValidationRuleMarkup ValidateOnTargetUpdated=True}}"/>

I made a class called NotEmptyValidationRuleMarkup that returns an instance of NotEmptyValidationRule, and it sort-of works. Project builds just fine, it runs just fine, everything works exactly as I expect it to. However, I can no longer view my window in the designer. It gives me an Invalid Markup error because The property "ValidationRules" does not have an accessible setter.. And it's true, ValidationRules does not have a setter. If I try to set ValidationRules through code in C# I get a compile error. But for some reason when I assign it in XAML it actually does build and run just fine. I'm confused. Is there a way I can make this work without jacking up the design view of my window?