Problems with QMainWindow and layout

[franco.amato]

Hi to all,
I have a QMainWindow, a central widget ( as wanted by Qt ) and I would layout it.
In the centralWidget I would put vertically:
1 QScrollArea containing 1 custom widgets
1 QScrollArea containing 1 custom widgets
other controls.

I tried with a QVBoxLayout but I have problems with the scrollarea and the custom widget.

Can I have a help?

Best Regards,
Franco

[caduel]

describe those problems, please...

[franco.amato]

describe those problems, please...

Dear Caduel,
the problem is that I can not see the custom widget. Is not displayed.
Here come code:

CentralWidget::CentralWidget( QWidget* parent /* = 0 */ ) 
: QWidget(parent),
  mp_vBox( 0 ),
  mp_wave( 0 )
{
	/* vertical laayout */
	mp_vBox = new QVBoxLayout( this );
	/* scroll area */
	scrollArea = new QScrollArea();
	/* waveform ( my custom widget ) */
	mp_wave = new WaveWidget( this );
	scrollArea->setWidget(mp_wave);
 	mp_vBox->addWidget( scrollArea );
        ..I would add another scrollArea
        ..with another WaveWidget
        ...and more controls ( buttons, etc )
	setLayout(mp_vBox);
 }

CentralWidget::CentralWidget( QWidget* parent /* = 0 */ ) 
: QWidget(parent),
  mp_vBox( 0 ),
  mp_wave( 0 )
{
	/* vertical laayout */
	mp_vBox = new QVBoxLayout( this );
	/* scroll area */
	scrollArea = new QScrollArea();
	/* waveform ( my custom widget ) */
	mp_wave = new WaveWidget( this );
	scrollArea->setWidget(mp_wave);
 	mp_vBox->addWidget( scrollArea );
        ..I would add another scrollArea
        ..with another WaveWidget
        ...and more controls ( buttons, etc )
	setLayout(mp_vBox);
 }

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I don't know where the code is wrong, but I can not see the WaveWidget.
The WaveWidget expand in the x direction so I need a scrollArea
Best,
Franco