title: Prism pop-up new window in WPF
body: <p>How can I open/close a new window in WPF without violating rules of the MVVM pattern?<br/> I just want to mimic the login module of ms office outlook.</p>
  
  <p>I've already read <a href="http://blog.magnusmontin.net/2013/04/20/implement-a-confirmation-dialog-in-wpf-with-mvvm-and-prism/" rel="nofollow noreferrer">this article</a>, but there are an error in passing a parameter <code>confirmation</code></p>
  
  <p>I'm currently using prism 5.0.</p>