issues regarding how to reimplement keyPressEvent()

Dear Friends,
I need to override the Esc key event so i tried to reimplement keyPressEvent() of QDialog. but it is not executed when i pressed any key. the code is given below.

Code:

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void Myclass::keyPressEvent(QKeyEvent *e)
{
    if(e->key()==Qt::Key_Escape)
    {
       QMessageBox(0,"Error","Key press");
    }
    else
    {
        QDialog::keyPressEvent(e);
    }
}

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while defining QDialog i gave setFocusPolicy(Qt::StrongFocus) as like below

Code:

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win = new QDialog(this);
QDialog::setFocusPolicy(Qt::StrongFocus);

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can any body help me where im getting wrong

the key event is being received by another widget in your dialog which has input focus.
You should install an evenFilter for that widget in your dialog and there trap the QKeyEvent.