title: Listing all Validation.Errors in a single WPF control?
body: <p>I'm trying to find a simple way of binding a single control (eg. TextBlock or ListBox) to list all the validation errors on a WPF form. Most source code examples I have been able to find just bind a control to (Validation.Errors)[0].ErrorContent which only shows a single validation error.</p>
  
  <p>I'm currently using ValidationRule classes, though I'm open to using IDataErrorInfo, or building a custom validator. I'm just not sure how to accomplish what I would expect to be a common use-case.</p>
  
  <p>How do I list all validation errors in one control on a WPF form?</p>