title: Advanced WPF Validation
body: <p>Could anybody provide any link to tutorial which fully explains WPF validation.</p>
  
  <p>I'm not interested in reviews, I'm interesting in MVVM-style validation using <code>IDataErrorInfo</code>.</p>
  
  <p>There are a lot of simple samples on the internet, but I couldn't find any advanced sample, including nested validation in UserControls e.t.c</p>