Problem with UI showing

[PoziomeQ]

Hi. I have a small problem.
my code:

ka::ka(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::ka)
{
 ui->setupUi(this);
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
go();
 
}

ka::ka(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::ka)
{
 ui->setupUi(this);
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
go();

}

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The function go(); is running before UI is showed but I dont want it like that.
The Ui should be show first, and then go(); should be run.
Could You help me?
Sorry for my bad english
Thanks