Thanks for your reply. Your workaround gave me an idea that is currently working.  It seemed to me that a new ''DataGridDetailDescription'' is created for each parent row, as opposed to using this object in a static way (no static methods).  So, I created my own workaround by changing my implementation of the DataGridDescription class ...

I had already implemented a DataGridDetailDescription.  It is working in the sense that I can expand any parent row and the child objects are displayed in child rows in a subgrid.  See the code below: (modified slightly to rename the names of my variables)   class ParentDetail : ...

Does version 3.0 supports ObservableCollection for editing and adding new record? Or we still have to use IBindingList Interface. If yes can you guide me with any examples. Thanks  Atul   

  I am not able to find any example where we can add,edit data based on ObservableCollection. Can we do that? or are we stuck with bindableList. Secondly if the above data is exposed in combobox do how exactly we use xcdg:CellEditorBinding Thanks