tabWidget duplicate frames

[anda_skoa]

The explicit connect would look something like this

MainWindow::MainWindow(QWidget* parent) 
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    connect(ui->tabWidget, &QTabWidget::currentChanged, this, &MainWindow::onCurrentTabChanged);
}

MainWindow::MainWindow(QWidget* parent) 
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    connect(ui->tabWidget, &QTabWidget::currentChanged, this, &MainWindow::onCurrentTabChanged);
}

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where onCurrentTabChanged would be the function you currently have, just with a different name. Can be any valid method name in that class.

Cheers,
_

[ilmandorlone]

really thank you for your patience.

I'm sorry but I have not figured out how to attach my widget to the new tab.

in my example the new tab windows are always empty and you do not see the widget

[mynamebilalzahid]

where will you run the tab ?

[anda_skoa]

I'm sorry but I have not figured out how to attach my widget to the new tab.

in my example the new tab windows are always empty and you do not see the widget

addTab() should do that.
Does your widget work stand alone?
E.g. testing as a separate window by calling serialTab->show() instead of passing it to addTab?

Cheers,
_