RowIndex
if (!fModel->GetValueAt(field->RowIndex(), modelIndex, value))
bool valid1 = fModel->GetValueAt(field1->RowIndex(), modelIndex, value1);
bool valid2 = fModel->GetValueAt(field2->RowIndex(), modelIndex, value2);
if (!fModel->GetValueAt(field->RowIndex(), modelIndex, value))
return field->RowIndex();