Best way to set focus to the application?

[hakermania]

Hello, when one instance of my program detects another instance it sends a message to the already running instance and it tries to strongly focus itself.
The code that does the focus is:

this->showNormal();
        this->setFocusPolicy(Qt::StrongFocus);
        this->setFocus();
        this->raise();
        this->setVisible(true);
        this->activateWindow();

this->showNormal();
        this->setFocusPolicy(Qt::StrongFocus);
        this->setFocus();
        this->raise();
        this->setVisible(true);
        this->activateWindow();

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And all these in a row result to only a blinking minimize-bar, just like the program wants user's attention, but I need stronger focus, like go top of all the other windows.
How is this possible? Thanks!