I am struggling to get validation in the XamPropertyGrid to work as expected, and have a couple of questions:

1. Out of the box, the XamPropertyGrid looks to be handling exceptions thrown in my object's properties by displaying a dialog box when I press Enter in the corresponding editor. Is there any built-in way to customize this experience to use custom validation error templates directly in the editors?

2. To get a custom validation error experience I have tried writing my custom editors, as e.g. the simple editor below for strings:

<ig:PropertyGridEditorDefinition TargetType="system:String">
  <ig:PropertyGridEditorDefinition.EditTemplate>
    <DataTemplate>
      <TextBox Background="LightBlue">
        <TextBox.Text>
          <Binding Path="Value"
                   Mode="TwoWay"
                   UpdateSourceTrigger="PropertyChanged">
            <Binding.ValidationRules>
              <validationRules:StringNotEmptyValidationRule />
              <DataErrorValidationRule />
              <ExceptionValidationRule />
            </Binding.ValidationRules>
          </Binding>
        </TextBox.Text>
      </TextBox>
    </DataTemplate>
  </ig:PropertyGridEditorDefinition.EditTemplate>
</ig:PropertyGridEditorDefinition>

The problem with the above editor is that any custom validation error template is not used when my properties are e.g. throwing exceptions (using the ExceptionValidationRule). The built in DataErrorValidationRule has the same issue.

However, if I add my own validation rule everything works as expected. In the above code I have a custom validation rule that checks for empty strings. Triggering this rule show the validation error template correctly, as shown in the attached image. Throwing an exception in my property setter show no error indication at all.

How can I get proper validation in my custom editor?

Regards,
Leif