2.  WPF framework treats binding errors as
messages
 Built in functionality: Display on Output
window

3.  Output window contains thousand of
messages from different listeners

4.  A misspell on property name
 The viewmodel is too complex
 The template of the view could be equally
complex

5.  Isolates the messages in one window
 Filter/Find functionality
 Attach/Detach listener on demand
 Attributes are extracted & categorised
 Can treat messages as exceptions
 Visual studio will jump into XAML