QTreeWidget clicked signal

[faldzip]

It is hard to understand what you are saying but your code where you add new tab is wrong. For what do you need new QTabBar?
It should be like this:

main_tab_widget->insertTab(0, new plcconfiguration(main_tab_widget), "PLC");
main_tab_widget->setCurrentIndex(0);

main_tab_widget->insertTab(0, new plcconfiguration(main_tab_widget), "PLC");
main_tab_widget->setCurrentIndex(0);

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