problem with Context Menu in QTableWidget

[andreime]

Hello. I am trying to make a right click context menu appear over an item inside a QTableWidget.
I tried several things, but somehow it is not working or, not working properly.

void fileHandler::ctxMenu(const QPoint &pos)//started
{   
    QMenu *menu = new QMenu;
    menu->addAction(tr("Test Item"), this, SLOT(test_slot()));
    menu->addSeparator();
    menu->addAction(tr("Test Item"), this, SLOT(test_slot()));
    menu->exec(m_ui->tableWidget->mapToGlobal(pos));
}

void fileHandler::ctxMenu(const QPoint &pos)//started
{   
    QMenu *menu = new QMenu;
    menu->addAction(tr("Test Item"), this, SLOT(test_slot()));
    menu->addSeparator();
    menu->addAction(tr("Test Item"), this, SLOT(test_slot()));
    menu->exec(m_ui->tableWidget->mapToGlobal(pos));
}

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In the constructor i am doing this:

connect(m_ui->tableWidget, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(ctxMenu(const QPoint &)));

connect(m_ui->tableWidget, SIGNAL(customContextMenuRequested(const QPoint &)), this, SLOT(ctxMenu(const QPoint &)));

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The problem with this thing is that when i right click on an item the popup menu appears not next to the x,y coordinates of where i clicked but somewhat x+50 px or so(only for the example i have). i also want to have a context menu only on items. I couldn't find anything to work like i want.
I want to add operations with fast navigation using the context menu for selected item or items. Thank you.