Sorry for the delay caused.
In our implementation, we get the type of the column properties from its default constructor. When we try to type in AddNewRow, it will try to get the model details. But in DomainGridDataControl, we could not get column properties from the model, since the model is Domain Service Entity class and the Entity class does not have the default constructor. So NullReferenceException will be thrown when we try to type in AddNewRow, as the constructor is set to null. We have fixed that exception in our current source.
However, we do not provide confidential information and patches in the general forum.
You can also create an incident in our Direct trac account with the below link.
That would be helpful for us to fix the issues and provide you the patch through incident.
But we regret to let you know that we do not have support for adding new row by using AddNewRow functionality in DomainGridDataControl.
Please let us know if you need any further assistance.