I went throught suggested "questions" about my problem. However neither does not solve it. I program two windows. The second window is opening from first window. I need active the both windows, however to start the first window(MainWindow) I use: int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.setWindowModality(Qt::NonModal); return a.exec(); }… Read More QTCreator 5.0.2, parallel run of two window, C++