title: Disable validation on disabled TextBox
body: <pre><code>&lt;Binding Path="AttachmentName" UpdateSourceTrigger="PropertyChanged"&gt;
                            &lt;Binding.ValidationRules&gt;
                                  &lt;valid:AttachmentNameValidationRule ValidationStep="RawProposedValue" ValidatesOnTargetUpdated="True"/&gt;
                            &lt;/Binding.ValidationRules&gt;
                      &lt;/Binding&gt;
  </code></pre>
  
  <p>Validator checks if entered value is in proper format: file.extension. Unfortunelly, textBox is red when control IsEnabled == false (because content is "").</p>
  
  <p>Any idea how to disable validation? Tried some stuff with x:referense and passing UIElement to validator, but didnt work.</p>