strange behaviour with Qt key_space

[franco.amato]

Hi,
I'm implementing my

void myWidget::keyPressEvent( QKeyEvent* pe )
{
 ..code ..
}

void myWidget::keyPressEvent( QKeyEvent* pe )
{
 ..code ..
}

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where I catch some keys. I have a problem with the space. I would run a routine when I press the space key so:

// start/stop
case Qt::Key_Space:
	{
	qDebug() << "WaveWidget::keyPressEvent";
	bool playing;
	m_wave->getCurrentChannel()->isPlaying( &playing );
	if( playing == false )
		playSound(); 
	else
		StopSound(); 
	break;
	}

// start/stop
case Qt::Key_Space:
	{
	qDebug() << "WaveWidget::keyPressEvent";
	bool playing;
	m_wave->getCurrentChannel()->isPlaying( &playing );
	if( playing == false )
		playSound(); 
	else
		StopSound(); 
	break;
	}

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It simply doesn't work. If I change Key_Space with another key I have no problems.
Which can be the problem?