title: unable to add row to a winforms datagridview that is bound to a SortableBindngList
body: <p>I have a datagridview that was bound to a generic List&lt;&gt; of my objects.   Everything works fine.   I then changed the List to a SortableBindingList so that I can sort the columns.   This works fine to except now I get an exception when I try to add a row.   The exception is:</p>
  <p>&quot;Operation is not valid due to the current state of the object.&quot;</p>
  <p>This occurs in the WinForms runtime in DatagridView.DataGridviewDataConnection.ProcessListChanged method.</p>
  <p>Anyone have any ideas what the problem might be?</p>