The DataGrid is tied to a DataView of a DataSet. If the user starts to add a row and then exits the window they can leave behind a row with a duplicate key or null key. This leaves a transaction in progress. When they try and open the window again there is an exception:
'DeferRefresh' is not allowed durning an AddNew or EditItem transaction.
Two choices:
1. How can I cancel the transaction on closing the window if something is invalid?
2. How can I cancel a pending transaction on opening the window? I have been able to trap this error.
