I'm using IBindableTemplate for custom templates in the BulkEditGridView. I depended on the RowCommand event firing so that the IBindableTemplate ExtractValues would do something special, but it didn't in the new grid, because it is actually the Update
button's event that is firing.
So I added the following just before the "this.UpdateRow(row, false);" in UpdateGridView.
this.OnRowCommand(new GridViewCommandEventArgs(this, new CommandEventArgs("Update", "")));
You might want this in the original. It should not harm anything, and it caused my code to work like it did with GridView.