title: Infragistics XamDataGrid - cast DataSource back to collection type
body: <p>This is probably a long shot - I'm trying to write a behavior for a control containing a XamDataGrid that includes up and down buttons (to move the grid rows)</p>
  
  <p>I'd like to somehow how access the underlying data source type (which will always be an ObservableCollection of T). Is there any way to pull out the underlying observable collection?</p>
  
  <p>Thanks</p>