Question about: correct Signaling from QTabWidget to its Tabs?

[Astronomy]

Hello,
I'm using two Tabs in a Mainwindow. I do load a Workspace from the Mainwindow, and want some Comboboxes in Tab2 get filled in with the Data i load from a file.. (all done in mainw...)

The Problem: m_ui.ComboBox from Tab1 and Tab2 are private. What is the best approach here?

Making an Object CTab2 *Tab2 = new CTab2; inside int main(){...} and make the m_ui from Tab1+2 public? (through this is very ugly..) Or can i use a signal? but the signals i've tried are also not visible from outside mainw, Tab1 or Tab2
(i use signals from the designer and they do not correspond to other m_ui's ??)

Thanks in advance,
Astronomy

class Tab1;  // other Mainwindow - widgets from the Qt Designer...
class Tab2;
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    CMainWindow *mainw = new CMainWindow;
    #if (QT_VERSION < 0x040000)
    a.setMainWidget(&mainw);
    #endif
 
    QTabWidget *Tab = new QTabWidget(mainw);
    Tab->addTab(new Tab1, "Tab1");
    Tab->addTab(new Tab2, "Tab2");
    mainw->setCentralWidget(Tab);
    mainw->show();
 
    return a.exec();
}

class Tab1;  // other Mainwindow - widgets from the Qt Designer...
class Tab2;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    CMainWindow *mainw = new CMainWindow;
    #if (QT_VERSION < 0x040000)
    a.setMainWidget(&mainw);
    #endif

    QTabWidget *Tab = new QTabWidget(mainw);
    Tab->addTab(new Tab1, "Tab1");
    Tab->addTab(new Tab2, "Tab2");
    mainw->setCentralWidget(Tab);
    mainw->show();

    return a.exec();
}

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