title: Getting many Binding "Information" in WPF output window
body: <p>When I start my app I get a lot of information like this:</p>
  
  <pre><code>System.Windows.Data Information: 10 : Cannot retrieve value using the binding and 
  no valid fallback value exists; using default instead. 
  BindingExpression:Path=Period; DataItem=null; target element is 'TextBlock' (Name=''); 
  target property is 'Text' (type 'String')
  
  System.Windows.Data Information: 10 : Cannot retrieve value using the binding and 
  no valid fallback value exists; using default instead. 
  BindingExpression:Path=DocumentId; DataItem=null; target element is 'TextBlock' (Name=''); 
  target property is 'Text' (type 'String')
  </code></pre>
  
  <p>Should I care for that output?</p>