Add new row to matrix during et_CHOOSE_FROM_LIST event

Hey All,

Has anyone ever done this on a sales order or quote document? When I use the et_CHOOSE_FROM_LIST event on the itemcode in the matrix I can add a new row but it seems to mess up B1. It does not input the selected itemcode into the matrix line. I guess it gets messed up because of my new row.

Any ideas on how else I could do that?