QList<QStringList> elemen t not getting replaced!

[Kushan]

In my Qt c++ application I have a QList<QStringList> named "names". It has size of 10(has 10 QStringLists). But when I try to insert a new QStringList to an existing position and try to print the values the old QStringList remains in that postion!How can I correct this?
The code is as follows:
void NewOrders::createNewName(){
QString firstName="John";
QString lastName="Smith";

QStringList newName;
newName<<firstName<<lastName;
names[2]<<newName;
}

void MainWindow::on_pushButton_clicked(){
QString concatName="";
for(int i<0;i<names[2].size();i++){
concatName+=names[2][i];
}
ui->label->setText(concatname);
}

but when I print the contents of names[2] by pressing the button still the old name appears not John Smith! How can I correct this?

[J.Hilk]

@Kushan
Hi, try it with this one, replace

names[2]<<newName;

with

names.replace(2,newName);

[Kushan]

@J.Hilk Thanx alot