title: WPF Separate Error and Warning Styles
body: <p>How can we show user Warnings in a similar way to Errors. The only difference is that the control e.g. TextBox needs to have a different error template and similar to Validation.HasError there needs to be a Validation.HasWarning.</p>
  
  <p>In other words not all validation issues are "errors" (in our application at least). We want to visually indicate whether something is a warning or error.</p>