title: WPF DataGrid CanUserAddRows into ObservableCollection
body: <p>On a Datagrid I have CanUserAddRows set to be true, however, when I do add a row via the grid is there an event that can be fired so I can see that the ObservableCollection is actually being added?</p>
  
  <p><em>I say this logic as the infragistics library fires an event when a user adds a row from the grid</em></p>
  
  <p>Cheers</p>