issues regarding how to reimplement keyPressEvent()

[Askar]

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.

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

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

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

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

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can any body help me where im getting wrong