title: Showing Invalid XML Syntax with AvalonEdit
body: <p>I am trying to use <a href="http://www.codeproject.com/KB/edit/AvalonEdit.aspx" rel="noreferrer">AvalonEdit</a> as a XML text editor in my WPF application. However, it doesn't do any formatting (such as wavy lines) when it encounters invalid syntax.</p>
  
  <p>I will like to know if such function can be done using AvalonEdit, or if there is other alternatives. Thanks!</p>