QTableWidget can't scroll automaticlly

[nthung]

When ai drag a QTableWidget in to UI, then i add new rows but it can't scroll automaticlly. I don't know how to fix this.
Thanks

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Added after 45 minutes:

Sorry
I fixed as below

int counterRow=ui->tableWidget->rowCount();
 ui->tableWidget->insertRow(counterRow);

int counterRow=ui->tableWidget->rowCount();
 ui->tableWidget->insertRow(counterRow);

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