My QTableWidget doesn't want to let me add a title to a new row with the button

[Martindb]

I am creating a stock controlling system,but when I add the new row I can edit the product numbers and everything, except for the new product,please help.
Thank you in advance

my code :

int row;
row = ui->tableWidget->rowCount();
ui->tableWidget->setRowCount(row +1);

int row;
row = ui->tableWidget->rowCount();
ui->tableWidget->setRowCount(row +1);

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